%% tikzlibrarytikzphysics.fluids.code.tex
%% -----------------------------------------------------------
%% Editable fluid-mechanics nodes and teaching schematics.
%%
%% Public nodes:
%%   fluid tank, fluid cylinder, pressure element, meniscus,
%%   rotating fluid, flow tube, liquid ring, u tube
%% Public pics:
%%   u tube diagram, gas manometer, hydraulic press,
%%   fluid cylinder diagram, fluid tank diagram, pressure element diagram,
%%   rotating tube, rotating fluid diagram, buoyancy, flow tube diagram,
%%   meniscus diagram, capillary, surface tension ring, liquid ring diagram
%%
%% Geometry lengths accept TeX units or unitless centimetres.
%% Levels are fractions of height; angles are in degrees.
%%
%% Author  : Vaibhav Blayer
%% Version : v1.5.0 (2026-09-26)
%% License : LPPL 1.3c
%% -----------------------------------------------------------
\usetikzlibrary{tikzphysics.core}
\usetikzlibrary{calc,arrows.meta,patterns}
\makeatletter
\pgfkeysgetvalue{/tikz/fill/.@cmd}{\tikzphysics@fluid@nativefill}
\pgfkeysgetvalue{/tikz/pattern/.@cmd}{\tikzphysics@fluid@nativepattern}
\def\tikzphysics@fluid@applyfill#1{\tikzphysics@fluid@nativefill{#1}\pgfeov}
\def\tikzphysics@fluid@applypattern#1{\tikzphysics@fluid@nativepattern{#1}\pgfeov}
\tikzset{fluid pic base/.code={%
  \tikzset{fill/.code={\def\tikzphysics@fluid@picpaint{##1}\tikzphysics@fluid@applyfill{##1}},
    pattern/.code={\def\tikzphysics@fluid@picpaint{##1}\tikzphysics@fluid@applypattern{##1}}}},
  fluid liquid paint/.code={%
    \def\tikzphysics@fluid@none{none}%
    \ifx\tikzphysics@fluid@picpaint\tikzphysics@fluid@none
      \tikzset{fill=none}%
    \else\tikzset{fill}\fi}}
\newdimen\tikzphysics@fluid@length
\def\tikzphysics@fluid@positive#1#2{%
  \tikzphysics@resolve@length{\tikzphysics@fluid@length}{#2}%
  \pgfmathsetmacro#1{\tikzphysics@fluid@length/1cm}}
\def\tikzphysics@fluid@fraction#1#2{%
  \pgfmathparse{#2}\edef#1{\pgfmathresult}%
  \ifpgfmathunitsdeclared
    \PackageError{tikzphysics}{Fluid fractions must be unitless}{Use a number between zero and one.}\fi
  \ifdim#1pt<0pt \PackageError{tikzphysics}{Fluid fraction below zero}{Use a number between zero and one.}\fi
  \ifdim#1pt>1pt \PackageError{tikzphysics}{Fluid fraction above one}{Use a number between zero and one.}\fi}
\def\tikzphysics@fluid@scalar#1#2{%
  \pgfmathparse{#2}%
  \ifpgfmathunitsdeclared
    \PackageError{tikzphysics}{Fluid angles and bend must be unitless}{Use degrees for angles and a pure number for bend.}\fi
  \edef#1{\pgfmathresult}}
\tikzset{
  every fluid outline/.style={},
  every fluid liquid/.style={},
  every fluid secondary liquid/.style={fill=gray!55},
  every fluid label/.style={inner sep=.12em},
  every fluid arrow/.style={>={Latex[length=.65em,width=.45em]}},
  every fluid dimension/.style={every fluid arrow,<->},
  fluid width/.store in=\fwvalue, fluid height/.store in=\fhvalue,
  fluid tube width/.store in=\ftvalue,
  fluid level/.store in=\flvalue,
  fluid left level/.store in=\fllvalue, fluid right level/.store in=\frlvalue,
  fluid bend/.store in=\fbvalue,
  fluid angle/.store in=\favalue,
  fluid sweep/.store in=\fsvalue,
  fluid body label/.store in=\fbody,
  fluid left label/.store in=\fleft,
  fluid right label/.store in=\fright,
  fluid dimension label/.store in=\fdim,
  fluid force label/.store in=\fforce,
  fluid volume label/.store in=\fvolume,
  fluid pressure label/.store in=\fpressure,
  fluid pressure increment label/.store in=\fdpressure,
  fluid angular velocity label/.store in=\fomega,
  fluid position label/.store in=\fposition,
  fluid horizontal axis label/.store in=\fxaxis,
  fluid vertical axis label/.store in=\fyaxis,
  fluid inlet velocity label/.store in=\fvin,
  fluid outlet velocity label/.store in=\fvout,
  fluid contact angle label/.store in=\ftheta,
  fluid rise label/.store in=\frise,
  fluid tension label/.store in=\ftension,
  fluid circumference force label/.store in=\fringforce,
  fluid radius label/.store in=\fradius,
  fluid defaults/.style={fill=gray!25,pattern=dots,pattern color=black!55,fluid width=3cm,fluid height=3cm,
    fluid tube width=.3cm,fluid level=.65,fluid left level=.7,
    fluid right level=.5,fluid bend=.2,fluid angle=230,fluid sweep=65,
    fluid body label={},fluid left label={},fluid right label={},
    fluid dimension label={},fluid force label={$F$},fluid volume label={$V$},fluid pressure label={$p$},fluid pressure increment label={$p+dp$},fluid angular velocity label={$\omega$},fluid position label={$x$},fluid horizontal axis label={$x$},fluid vertical axis label={$y$},fluid inlet velocity label={$v_1$},fluid outlet velocity label={$v_2$},fluid contact angle label={$\theta$},fluid rise label={$h$},fluid tension label={$T\cos\theta$},fluid circumference force label={$T\cos\theta\,(2\pi r)$},fluid radius label={$r$}},
}
\def\tikzphysics@fluid@setup{%
  \tikz@textfont% Apply native pic/picture font before resolving em lengths.

  \tikzphysics@fluid@positive\fw{\fwvalue}%
  \tikzphysics@fluid@positive\fh{\fhvalue}%
  \tikzphysics@fluid@positive\ft{\ftvalue}%
  \tikzphysics@fluid@fraction\fl{\flvalue}%
  \tikzphysics@fluid@fraction\fll{\fllvalue}%
  \tikzphysics@fluid@fraction\frl{\frlvalue}%
  \tikzphysics@fluid@scalar\fb{\fbvalue}%
  \tikzphysics@fluid@scalar\fa{\favalue}%
  \tikzphysics@fluid@scalar\fs{\fsvalue}%
  \coordinate (-origin) at (0,0);
  \coordinate (-center) at (.5*\fw,.5*\fh);
  \coordinate (-bottom) at (.5*\fw,0);
  \coordinate (-top) at (.5*\fw,\fh);
  \coordinate (-left) at (0,.5*\fh);
  \coordinate (-right) at (\fw,.5*\fh);
}
\def\tikzphysics@fluid@tubecheck{%
  \pgfmathparse{min(\fw,\fh)/3>\ft?1:0}%
  \ifnum\pgfmathresult=0
    \PackageError{tikzphysics}{Fluid tube width is too large}{Use a tube width below one third of both width and height.}\fi
  \pgfmathparse{min(\fll,\frl)*\fh>\fw/2?1:0}%
  \ifnum\pgfmathresult=0
    \PackageError{tikzphysics}{U-tube levels intersect the bend}{Increase both levels or height, or reduce width.}\fi}
\def\tikzphysics@fluid@utube{%
  \tikzphysics@fluid@tubecheck
  \path[fluid liquid paint,every fluid liquid]
    (0,\fll*\fh)--(0,.5*\fw)
    arc[start angle=180,end angle=360,radius=.5*\fw cm]
    --(\fw,\frl*\fh)--(\fw-\ft,\frl*\fh)--(\fw-\ft,.5*\fw)
    arc[start angle=0,end angle=-180,radius={(.5*\fw-\ft)*1cm}]
    --(\ft,\fll*\fh)--cycle;
  \draw[every fluid outline] (0,\fh)--(0,.5*\fw)
    arc[start angle=180,end angle=360,radius=.5*\fw cm]--(\fw,\fh);
  \draw[every fluid outline] (\ft,\fh)--(\ft,.5*\fw)
    arc[start angle=180,end angle=360,radius={(.5*\fw-\ft)*1cm}]--(\fw-\ft,\fh);
  \draw[every fluid outline] (0,\fll*\fh)--(\ft,\fll*\fh)
    (\fw-\ft,\frl*\fh)--(\fw,\frl*\fh);
  \coordinate (-left-surface) at (.5*\ft,\fll*\fh);
  \coordinate (-right-surface) at (\fw-.5*\ft,\frl*\fh);
  \node[every fluid label,left] at (0,\fll*\fh) {\fleft};
  \node[every fluid label,right] at (\fw,\frl*\fh) {\fright};
  \node[every fluid label,below] at (-bottom) {\fbody};
}
\def\tikzphysics@fluid@tank{%
  \path[fluid liquid paint,every fluid liquid] (0,\fll*\fh)--(0,.2)
    .. controls (0,0) and (.1,0) .. (.25,0)
    --(\fw-.25,0).. controls (\fw,0) and (\fw,.1)..(\fw,.25)
    --(\fw,\frl*\fh)--cycle;
  \draw[every fluid outline] (0,\fh)--(0,.2)
    .. controls (0,0) and (.1,0)..(.25,0)
    --(\fw-.25,0).. controls (\fw,0) and (\fw,.1)..(\fw,.25)--(\fw,\fh);
  \coordinate (-left-surface) at (0,\fll*\fh);
  \coordinate (-right-surface) at (\fw,\frl*\fh);
  \coordinate (-surface) at (.5*\fw,{.5*(\fll+\frl)*\fh});
  \draw[every fluid outline] (-left-surface)--(-right-surface);
  \node[every fluid label,left] at (-left-surface) {\fleft};
  \node[every fluid label,right] at (-right-surface) {\fright};
  \node[every fluid label,below] at (-bottom) {\fbody};
}
\tikzset{physics fluid width/.style={fluid width={#1}},fluid width/.value required}
\tikzset{physics fluid height/.style={fluid height={#1}},fluid height/.value required}
\tikzset{physics fluid tube width/.style={fluid tube width={#1}},fluid tube width/.value required}
\tikzset{physics fluid level/.style={fluid level={#1}},fluid level/.value required}
\tikzset{physics fluid left level/.style={fluid left level={#1}},fluid left level/.value required}
\tikzset{physics fluid right level/.style={fluid right level={#1}},fluid right level/.value required}
\tikzset{physics fluid bend/.style={fluid bend={#1}},fluid bend/.value required}
\tikzset{physics fluid angle/.style={fluid angle={#1}},fluid angle/.value required}
\tikzset{physics fluid sweep/.style={fluid sweep={#1}},fluid sweep/.value required}
\tikzset{physics fluid body label/.style={fluid body label={#1}},fluid body label/.value required}
\tikzset{physics fluid left label/.style={fluid left label={#1}},fluid left label/.value required}
\tikzset{physics fluid right label/.style={fluid right label={#1}},fluid right label/.value required}
\tikzset{physics fluid dimension label/.style={fluid dimension label={#1}},fluid dimension label/.value required}
\tikzphysics@declarehook{u tube}
\tikzset{pics/u tube/.style args={#1}{code={%
\begin{scope}[fluid pic base,fluid defaults,fluid width=2cm,fluid height=4cm,fluid left level=.75,fluid right level=.55,every u tube,#1]%
\tikzphysics@fluid@setup

\tikzphysics@fluid@utube
% An optional second liquid above the interface in the left arm.
\pgfmathparse{\fl>\fll?1:0}
\ifnum\pgfmathresult=1
  \path[every fluid secondary liquid] (0,\fll*\fh) rectangle (\ft,\fl*\fh);
  \draw[every fluid outline] (0,\fl*\fh)--(\ft,\fl*\fh);
\fi
\coordinate (-interface) at (-left-surface);
\coordinate (-upper-surface) at (.5*\ft,{max(\fl,\fll)*\fh});

\end{scope}
}},pics/u tube/.default={},
pics/physics u tube/.style={/tikz/pics/u tube={#1}},pics/physics u tube/.default={}}
\tikzphysics@registeranchors{physicsutube}{origin,center,bottom,top,left,right,left-surface,right-surface,interface,upper-surface}
\tikzphysics@registerdisplayname{physicsutube}{u tube diagram}
\tikzphysics@registerkeydefaults{physicsutube}{fluid width/2cm,fluid height/4cm,fluid tube width/.3cm,fluid left level/.75,fluid right level/.55,fluid level/.65}
\tikzphysics@declarehook{gas manometer}
\tikzset{pics/gas manometer/.style args={#1}{code={%
\begin{scope}[fluid pic base,fluid defaults,fluid width=1.8cm,fluid height=3.8cm,fluid left level=.45,fluid right level=.8,fluid body label={gas},every gas manometer,#1]%
\tikzphysics@fluid@setup

\let\fgaslabel\fbody\def\fbody{}\tikzphysics@fluid@utube
\draw[every fluid outline] (\ft,\fh)--(\ft,\fh+.3)--(-.6,\fh+.3)
 --(-.6,\fh+.8)--(-2,\fh+.8)--(-2,\fh-1.3)--(-.6,\fh-1.3)
 --(-.6,\fh)--(0,\fh);
\coordinate (-gas) at (-1.3,\fh-.25);
\node[every fluid label] at (-gas) {\fgaslabel};

\end{scope}
}},pics/gas manometer/.default={},
pics/physics gas manometer/.style={/tikz/pics/gas manometer={#1}},pics/physics gas manometer/.default={}}
\tikzphysics@registeranchors{physicsgasmanometer}{origin,center,bottom,top,left,right,left-surface,right-surface,gas}
\tikzphysics@registerdisplayname{physicsgasmanometer}{gas manometer}
\tikzphysics@registerkeydefaults{physicsgasmanometer}{fluid width/1.8cm,fluid height/3.8cm,fluid tube width/.3cm,fluid left level/.45,fluid right level/.8}
\tikzphysics@declarehook{hydraulic press}
\tikzset{pics/hydraulic press/.style args={#1}{code={%
\begin{scope}[fluid pic base,fluid defaults,fluid width=4cm,fluid height=3.5cm,fluid left level=.4,fluid right level=.8,fluid left label={$L$},fluid right label={$S$},every hydraulic press,#1]%
\tikzphysics@fluid@setup

\pgfmathparse{\ft<.3*\fw && min(\fll,\frl)*\fh>\ft?1:0}
\ifnum\pgfmathresult=0 \PackageError{tikzphysics}{Invalid hydraulic press geometry}{Reduce tube width or increase piston levels.}\fi
\pgfmathsetmacro\faA{.32*\fw}
\path[fluid liquid paint,every fluid liquid] (0,\fll*\fh)--(0,0)--(\fw,0)--(\fw,\frl*\fh)
 --(\fw-\ft,\frl*\fh)--(\fw-\ft,\ft)--(\faA,\ft)--(\faA,\fll*\fh)--cycle;
\draw[every fluid outline] (0,\fh*.65)--(0,0)--(\fw,0)--(\fw,\fh);
\draw[every fluid outline] (\faA,\fh*.65)--(\faA,\ft)--(\fw-\ft,\ft)--(\fw-\ft,\fh);
\draw[every fluid outline,fill=gray!45] (0,\fll*\fh) rectangle (\faA,\fll*\fh+.12);
\draw[every fluid outline,fill=gray!45] (\fw-\ft,\frl*\fh) rectangle (\fw,\frl*\fh+.12);
\coordinate (-large-piston) at (.5*\faA,\fll*\fh+.12);
\coordinate (-small-piston) at (\fw-.5*\ft,\frl*\fh+.12);
\draw[every fluid arrow,->] ($( -small-piston)+(0,.7)$)--(-small-piston) node[pos=0,above,every fluid label] {\fforce};
\node[every fluid label,above] at (-large-piston) {\fbody};
\node[every fluid label,left] at (0,\fll*\fh) {\fleft};
\node[every fluid label,right] at (\fw,\frl*\fh) {\fright};
\draw[dashed,every fluid outline] (\faA,\fll*\fh)--(\fw-\ft,\fll*\fh);

\end{scope}
}},pics/hydraulic press/.default={},
pics/physics hydraulic press/.style={/tikz/pics/hydraulic press={#1}},pics/physics hydraulic press/.default={}}
\tikzphysics@registeranchors{physicshydraulicpress}{origin,center,bottom,top,left,right,large-piston,small-piston}
\tikzphysics@registerdisplayname{physicshydraulicpress}{hydraulic press}
\tikzphysics@registerkeydefaults{physicshydraulicpress}{fluid width/4cm,fluid height/3.5cm,fluid tube width/.3cm,fluid left level/.4,fluid right level/.8}
\tikzphysics@declarehook{fluid cylinder}
\tikzset{pics/fluid cylinder/.style args={#1}{code={%
\begin{scope}[fluid pic base,fluid defaults,fluid width=1.6cm,fluid height=3.2cm,every fluid cylinder,#1]%
\tikzphysics@fluid@setup

\path[fluid liquid paint,every fluid liquid] (0,\fl*\fh)--(0,.2) arc[start angle=180,end angle=360,x radius=.5*\fw cm,y radius=.2cm]
 --(\fw,\fl*\fh) arc[start angle=0,end angle=180,x radius=.5*\fw cm,y radius=.2cm];
\draw[every fluid outline] (.5*\fw,\fh) ellipse[x radius=.5*\fw cm,y radius=.2cm];
\draw[every fluid outline] (0,\fh)--(0,.2) arc[start angle=180,end angle=360,x radius=.5*\fw cm,y radius=.2cm]--(\fw,\fh);
\draw[every fluid outline] (.5*\fw,\fl*\fh) ellipse[x radius=.5*\fw cm,y radius=.2cm];
\coordinate (-surface) at (.5*\fw,\fl*\fh);
\node[every fluid label] at (.5*\fw,.5*\fl*\fh) {\fbody};

\end{scope}
}},pics/fluid cylinder/.default={},
pics/physics fluid cylinder/.style={/tikz/pics/fluid cylinder={#1}},pics/physics fluid cylinder/.default={}}
\tikzphysics@registeranchors{physicsfluidcylinder}{origin,center,bottom,top,left,right,surface}
\tikzphysics@registerdisplayname{physicsfluidcylinder}{fluid cylinder diagram}
\tikzphysics@registerkeydefaults{physicsfluidcylinder}{fluid width/1.6cm,fluid height/3.2cm,fluid level/.65}
\tikzphysics@declarehook{fluid tank}
\tikzset{pics/fluid tank/.style args={#1}{code={%
\begin{scope}[fluid pic base,fluid defaults,fluid left level=.7,fluid right level=.7,every fluid tank,#1]%
\tikzphysics@fluid@setup
\tikzphysics@fluid@tank
\end{scope}
}},pics/fluid tank/.default={},
pics/physics fluid tank/.style={/tikz/pics/fluid tank={#1}},pics/physics fluid tank/.default={}}
\tikzphysics@registeranchors{physicsfluidtank}{origin,center,bottom,top,left,right,left-surface,right-surface,surface}
\tikzphysics@registerdisplayname{physicsfluidtank}{fluid tank diagram}
\tikzphysics@registerkeydefaults{physicsfluidtank}{fluid width/3cm,fluid height/3cm,fluid left level/.7,fluid right level/.7}
\tikzphysics@declarehook{pressure element}
\tikzset{pics/pressure element/.style args={#1}{code={%
\begin{scope}[fluid pic base,fluid defaults,fluid width=2cm,fluid height=.65cm,fluid body label={$A$},fluid left label={$pA$},fluid right label={$(p+dp)A$},fluid dimension label={$dx$},every pressure element,#1]%
\tikzphysics@fluid@setup

\path[fluid liquid paint,every fluid liquid] (0,0) rectangle (\fw,\fh);
\draw[every fluid outline] (0,.5*\fh) ellipse[x radius=.12cm,y radius=.5*\fh cm];
\draw[every fluid outline] (\fw,.5*\fh) ellipse[x radius=.12cm,y radius=.5*\fh cm];
\draw[every fluid outline] (0,0)--(\fw,0) (0,\fh)--(\fw,\fh);
\draw[every fluid arrow,->] (-.7,.5*\fh)--(-.13,.5*\fh) node[pos=0,above left,every fluid label]{\fleft};
\draw[every fluid arrow,->] (\fw+.7,.5*\fh)--(\fw+.13,.5*\fh) node[pos=0,above right,every fluid label]{\fright};
\node[every fluid label] at (-center) {\fbody};
\draw[every fluid dimension] (0,-.35)--(\fw,-.35) node[midway,below,every fluid label]{\fdim};

\end{scope}
}},pics/pressure element/.default={},
pics/physics pressure element/.style={/tikz/pics/pressure element={#1}},pics/physics pressure element/.default={}}
\tikzphysics@registeranchors{physicspressureelement}{origin,center,bottom,top,left,right}
\tikzphysics@registerdisplayname{physicspressureelement}{pressure element diagram}
\tikzphysics@registerkeydefaults{physicspressureelement}{fluid width/2cm,fluid height/.65cm}
\tikzphysics@declarehook{rotating tube}
\tikzset{pics/rotating tube/.style args={#1}{code={%
\begin{scope}[fluid pic base,fluid defaults,fluid width=5cm,fluid height=.5cm,fluid level=.48,fluid dimension label={$dx$},every rotating tube,#1]%
\tikzphysics@fluid@setup

\pgfmathparse{\fl*\fw+\ft<\fw?1:0}
\ifnum\pgfmathresult=0 \PackageError{tikzphysics}{Rotating tube element leaves the tube}{Reduce level or tube width.}\fi
\path[fluid liquid paint,every fluid liquid] (0,0) rectangle (\fw,\fh);
\draw[every fluid outline] (0,0) rectangle (\fw,\fh);
\draw[every fluid outline,fill=gray!50] (\fl*\fw,0) rectangle (\fl*\fw+\ft,\fh);
\coordinate (-element-left) at (\fl*\fw,.5*\fh);
\coordinate (-element-right) at (\fl*\fw+\ft,.5*\fh);
\draw[every fluid arrow,->] (0,-.3)--(0,\fh+.9);
\draw[every fluid arrow,->] (.32,\fh+.65) arc[start angle=25,end angle=335,x radius=.35cm,y radius=.12cm] node[right,every fluid label] {\fomega};
\draw[every fluid arrow,->] ($( -element-left)+(-.8,0)$)--(-element-left) node[pos=0,above,every fluid label] {\fpressure};
\draw[every fluid arrow,->] ($( -element-right)+(.8,0)$)--(-element-right) node[pos=0,above,every fluid label] {\fdpressure};
\draw[every fluid dimension] (0,-.3)--(\fl*\fw,-.3) node[midway,below,every fluid label] {\fposition};
\node[every fluid label,above] at (\fl*\fw+.5*\ft,\fh+.1) {\fdim};

\end{scope}
}},pics/rotating tube/.default={},
pics/physics rotating tube/.style={/tikz/pics/rotating tube={#1}},pics/physics rotating tube/.default={}}
\tikzphysics@registeranchors{physicsrotatingtube}{origin,center,bottom,top,left,right,element-left,element-right}
\tikzphysics@registerdisplayname{physicsrotatingtube}{rotating tube}
\tikzphysics@registerkeydefaults{physicsrotatingtube}{fluid width/5cm,fluid height/.5cm,fluid tube width/.3cm,fluid level/.48}
\tikzphysics@declarehook{rotating fluid}
\tikzset{pics/rotating fluid/.style args={#1}{code={%
\begin{scope}[fluid pic base,fluid defaults,fluid width=3cm,fluid height=3.5cm,fluid level=.5,fluid bend=.35,every rotating fluid,#1]%
\tikzphysics@fluid@setup

\pgfmathparse{\fb>=0 && \fl+\fb<=1?1:0}
\ifnum\pgfmathresult=0 \PackageError{tikzphysics}{Rotating surface leaves the vessel}{Use bend >= 0 and level + bend <= 1.}\fi
\path[fluid liquid paint,every fluid liquid] (0,0)--(\fw,0)--(\fw,{(\fl+\fb)*\fh})
 --plot[domain=\fw:0,samples=41] (\x,{\fh*(\fl+\fb*(2*\x/\fw-1)^2)})--cycle;
\draw[every fluid outline] (0,\fh)--(0,0)--(\fw,0)--(\fw,\fh);
\draw[every fluid outline] plot[domain=0:\fw,samples=41] (\x,{\fh*(\fl+\fb*(2*\x/\fw-1)^2)});
\coordinate (-vertex) at (.5*\fw,\fl*\fh);
\coordinate (-rim-surface) at (\fw,{(\fl+\fb)*\fh});
\draw[every fluid arrow,->] (-vertex)--(.5*\fw,\fh+.3) node[above,every fluid label] {\fyaxis};
\draw[every fluid arrow,->] (-vertex)--(\fw+.5,\fl*\fh) node[right,every fluid label] {\fxaxis};

\end{scope}
}},pics/rotating fluid/.default={},
pics/physics rotating fluid/.style={/tikz/pics/rotating fluid={#1}},pics/physics rotating fluid/.default={}}
\tikzphysics@registeranchors{physicsrotatingfluid}{origin,center,bottom,top,left,right,vertex,rim-surface}
\tikzphysics@registerdisplayname{physicsrotatingfluid}{rotating fluid diagram}
\tikzphysics@registerkeydefaults{physicsrotatingfluid}{fluid width/3cm,fluid height/3.5cm,fluid level/.5,fluid bend/.35}
\tikzphysics@declarehook{buoyancy}
\tikzset{pics/buoyancy/.style args={#1}{code={%
\begin{scope}[fluid pic base,fluid defaults,fluid left level=.8,fluid right level=.8,fluid body label={},fluid right label={$\rho_L$},every buoyancy,#1]%
\tikzphysics@fluid@setup

\tikzphysics@fluid@tank
\coordinate (-body) at (.5*\fw,.38*\fh);
\begin{scope}[shift={(-body)}]
\draw[every fluid outline,fill=white] (-.45,0) .. controls (-.55,.25) and (-.1,.35)..(0,.52)
 .. controls (.3,.65) and (.45,.25)..(.5,.05)
 .. controls (.55,-.2) and (.25,-.45)..(0,-.5)
 .. controls (-.25,-.55) and (-.25,-.15)..cycle;
\node[every fluid label] at (0,0) {\fvolume};
\foreach \a in {0,60,120,180,240,300}{
 \draw[every fluid arrow,->] (\a:.9)--(\a:.56);}
\end{scope}

\end{scope}
}},pics/buoyancy/.default={},
pics/physics buoyancy/.style={/tikz/pics/buoyancy={#1}},pics/physics buoyancy/.default={}}
\tikzphysics@registeranchors{physicsbuoyancy}{origin,center,bottom,top,left,right,left-surface,right-surface,surface,body}
\tikzphysics@registerdisplayname{physicsbuoyancy}{buoyancy}
\tikzphysics@registerkeydefaults{physicsbuoyancy}{fluid width/3cm,fluid height/3cm,fluid left level/.8,fluid right level/.8}
\tikzphysics@declarehook{flow tube}
\tikzset{pics/flow tube/.style args={#1}{code={%
\begin{scope}[fluid pic base,fluid defaults,fluid width=5cm,fluid height=1.3cm,fluid bend=.45,fluid left label={$A_1$},fluid right label={$A_2$},every flow tube,#1]%
\tikzphysics@fluid@setup

\path[fluid liquid paint,every fluid liquid] (0,0).. controls (.35*\fw,\fb*\fh) and (.65*\fw,-\fb*\fh)..(\fw,\fb*\fh)
 --(\fw,\fb*\fh+.55*\fh).. controls (.65*\fw,.55*\fh-\fb*\fh) and (.35*\fw,\fh+\fb*\fh)..(0,\fh)--cycle;
\draw[every fluid outline] (0,0).. controls (.35*\fw,\fb*\fh) and (.65*\fw,-\fb*\fh)..(\fw,\fb*\fh)
 (0,\fh).. controls (.35*\fw,\fh+\fb*\fh) and (.65*\fw,.55*\fh-\fb*\fh)..(\fw,\fb*\fh+.55*\fh);
\draw[every fluid outline] (0,0)--(0,\fh) (\fw,\fb*\fh)--(\fw,\fb*\fh+.55*\fh);
\coordinate (-inlet) at (0,.5*\fh);
\coordinate (-outlet) at (\fw,\fb*\fh+.275*\fh);
\draw[every fluid arrow,->] (-inlet)--++(.8,0) node[right,every fluid label] {\fvin};
\draw[every fluid arrow,->] (-outlet)--++(.8,0) node[right,every fluid label] {\fvout};
\node[every fluid label,below] at (0,0) {\fleft};
\node[every fluid label,below] at (\fw,\fb*\fh) {\fright};

\end{scope}
}},pics/flow tube/.default={},
pics/physics flow tube/.style={/tikz/pics/flow tube={#1}},pics/physics flow tube/.default={}}
\tikzphysics@registeranchors{physicsflowtube}{origin,center,bottom,top,left,right,inlet,outlet}
\tikzphysics@registerdisplayname{physicsflowtube}{flow tube diagram}
\tikzphysics@registerkeydefaults{physicsflowtube}{fluid width/5cm,fluid height/1.3cm,fluid bend/.45}
\tikzphysics@declarehook{meniscus}
\tikzset{pics/meniscus/.style args={#1}{code={%
\begin{scope}[fluid pic base,fluid defaults,fluid width=1.2cm,fluid height=2.7cm,fluid level=.7,fluid bend=.2,every meniscus,#1]%
\tikzphysics@fluid@setup

\pgfmathparse{\fl-abs(\fb)>=0 && \fl+abs(\fb)<=1?1:0}
\ifnum\pgfmathresult=0 \PackageError{tikzphysics}{Meniscus leaves the vessel}{Reduce the absolute bend or move the level.}\fi
\path[fluid liquid paint,every fluid liquid] (0,0)--(\fw,0)--(\fw,\fl*\fh)
 .. controls (.67*\fw,{(\fl-\fb)*\fh}) and (.33*\fw,{(\fl-\fb)*\fh})..(0,\fl*\fh)--cycle;
\draw[every fluid outline] (0,\fh)--(0,0)--(\fw,0)--(\fw,\fh);
\draw[every fluid outline] (0,\fl*\fh).. controls (.33*\fw,{(\fl-\fb)*\fh}) and (.67*\fw,{(\fl-\fb)*\fh})..(\fw,\fl*\fh);
\coordinate (-contact-left) at (0,\fl*\fh);
\coordinate (-contact-right) at (\fw,\fl*\fh);
\coordinate (-surface) at (.5*\fw,{(\fl-.75*\fb)*\fh});
% Contact angle measured inside the liquid between downward wall and tangent.
\pgfmathsetmacro\fangle{atan2(-\fb*\fh,.33*\fw)}
\draw[dashed,every fluid outline] (-contact-left)--++(\fangle:.7);
\draw[every fluid outline] ($( -contact-left)+(0,-.4)$) arc[start angle=-90,end angle=\fangle,radius=.4cm];
\node[every fluid label] at ($( -contact-left)+({(-90+\fangle)/2}:.58)$) {\ftheta};

\end{scope}
}},pics/meniscus/.default={},
pics/physics meniscus/.style={/tikz/pics/meniscus={#1}},pics/physics meniscus/.default={}}
\tikzphysics@registeranchors{physicsmeniscus}{origin,center,bottom,top,left,right,contact-left,contact-right,surface}
\tikzphysics@registerdisplayname{physicsmeniscus}{meniscus diagram}
\tikzphysics@registerkeydefaults{physicsmeniscus}{fluid width/1.2cm,fluid height/2.7cm,fluid level/.7,fluid bend/.2}
\tikzphysics@declarehook{capillary}
\tikzset{pics/capillary/.style args={#1}{code={%
\begin{scope}[fluid pic base,fluid defaults,fluid width=4cm,fluid height=3cm,fluid level=.35,fluid left level=.7,fluid bend=.12,every capillary,#1]%
\tikzphysics@fluid@setup

\pgfmathparse{\fb>=0 && \fll-.75*\fb>=\fl?1:0}
\ifnum\pgfmathresult=0 \PackageError{tikzphysics}{Invalid capillary rise}{Use bend >= 0 and left level - 0.75*bend >= level.}\fi
\pgfmathsetmacro\fcL{.4*\fw}
\pgfmathsetmacro\fcR{.6*\fw}
\path[fluid liquid paint,every fluid liquid] (0,\fl*\fh)--(0,.2)
 .. controls (0,0) and (.1,0)..(.3,0)--(\fw-.3,0)
 .. controls (\fw,0) and (\fw,.1)..(\fw,.2)--(\fw,\fl*\fh)--cycle;
\path[fluid liquid paint,every fluid liquid] (\fcL,\fl*\fh)--(\fcR,\fl*\fh)--(\fcR,\fll*\fh)
 .. controls (.53333*\fw,{(\fll-\fb)*\fh}) and (.46667*\fw,{(\fll-\fb)*\fh})..(\fcL,\fll*\fh)--cycle;
\draw[every fluid outline] (0,\fh)--(0,.2).. controls (0,0) and (.1,0)..(.3,0)
 --(\fw-.3,0).. controls (\fw,0) and (\fw,.1)..(\fw,.2)--(\fw,\fh);
\draw[every fluid outline] (\fcL,\fl*\fh-.2)--(\fcL,\fh)
 (\fcR,\fl*\fh-.2)--(\fcR,\fh);
\draw[every fluid outline] (\fcL,\fll*\fh).. controls (.46667*\fw,{(\fll-\fb)*\fh}) and (.53333*\fw,{(\fll-\fb)*\fh})..(\fcR,\fll*\fh);
\coordinate (-contact-left) at (\fcL,\fll*\fh);
\coordinate (-contact-right) at (\fcR,\fll*\fh);
\coordinate (-reservoir) at (.2*\fw,\fl*\fh);
\draw[every fluid dimension] (.2*\fw,\fl*\fh)--(.2*\fw,\fll*\fh) node[midway,left,every fluid label] {\frise};
\draw[every fluid arrow,->] (-contact-left)--++(0,.8) node[above left,every fluid label] {\ftension};
\draw[every fluid arrow,->] (-contact-right)--++(0,.8) node[above right,every fluid label] {\ftension};

\end{scope}
}},pics/capillary/.default={},
pics/physics capillary/.style={/tikz/pics/capillary={#1}},pics/physics capillary/.default={}}
\tikzphysics@registeranchors{physicscapillary}{origin,center,bottom,top,left,right,contact-left,contact-right,reservoir}
\tikzphysics@registerdisplayname{physicscapillary}{capillary}
\tikzphysics@registerkeydefaults{physicscapillary}{fluid width/4cm,fluid height/3cm,fluid level/.35,fluid left level/.7,fluid bend/.12}
\tikzphysics@declarehook{surface tension ring}
\tikzset{pics/surface tension ring/.style args={#1}{code={%
\begin{scope}[fluid pic base,fluid defaults,fluid width=3cm,fluid height=1cm,every surface tension ring,#1]%
\tikzphysics@fluid@setup

\draw[every fluid outline] (-center) ellipse[x radius=.5*\fw cm,y radius=.5*\fh cm];
\draw[every fluid outline] (-center) ellipse[x radius=.46*\fw cm,y radius=.42*\fh cm];
\foreach \a in {20,70,120,170,220,270,320}{
 \draw[every fluid arrow,->] ({.5*\fw+.48*\fw*cos(\a)},{.5*\fh+.46*\fh*sin(\a)})--++(0,.65);}
\node[every fluid label,above] at (.5*\fw,\fh+.7) {\fringforce};

\end{scope}
}},pics/surface tension ring/.default={},
pics/physics surface tension ring/.style={/tikz/pics/surface tension ring={#1}},pics/physics surface tension ring/.default={}}
\tikzphysics@registeranchors{physicssurfacetensionring}{origin,center,bottom,top,left,right}
\tikzphysics@registerdisplayname{physicssurfacetensionring}{surface tension ring}
\tikzphysics@registerkeydefaults{physicssurfacetensionring}{fluid width/3cm,fluid height/1cm}
\tikzphysics@declarehook{liquid ring}
\tikzset{pics/liquid ring/.style args={#1}{code={%
\begin{scope}[fluid pic base,fluid defaults,fluid width=3.5cm,fluid height=3.5cm,fluid tube width=.4cm,fluid angle=225,fluid sweep=70,fluid body label={$O$},every liquid ring,#1]%
\tikzphysics@fluid@setup

\pgfmathparse{\ft<.5*\fw && \fs>0 && \fs<=360?1:0}
\ifnum\pgfmathresult=0 \PackageError{tikzphysics}{Invalid liquid ring geometry}{Use tube width < width/2 and sweep in (0,360].}\fi
\begin{scope}[shift={(-center)}]
\path[fluid liquid paint,every fluid liquid] (\fa:{.5*\fw}) arc[start angle=\fa,delta angle=\fs,radius=.5*\fw cm]
 --({\fa+\fs}:{.5*\fw-\ft}) arc[start angle=\fa+\fs,delta angle=-\fs,radius={(.5*\fw-\ft)*1cm}]--cycle;
\draw[every fluid outline] (0,0) circle[radius=.5*\fw cm] (0,0) circle[radius={(.5*\fw-\ft)*1cm}];
\draw[every fluid outline] (\fa:{.5*\fw-\ft})--(\fa:{.5*\fw}) ({\fa+\fs}:{.5*\fw-\ft})--({\fa+\fs}:{.5*\fw});
\draw[dashed,every fluid outline] (\fa:{.5*\fw-\ft})--(0,0)--({\fa+\fs}:{.5*\fw-\ft});
\draw[every fluid outline] (\fa:.4) arc[start angle=\fa,delta angle=\fs,radius=.4cm];
\node[every fluid label] at ({\fa+.5*\fs}:.65) {\ftheta};
\draw[every fluid arrow,->] (0,0)--(30:{.5*\fw-\ft}) node[midway,above,every fluid label] {\fradius};
\node[every fluid label,above left] at (0,0) {\fbody};
\coordinate (-liquid-start) at (\fa:{.5*\fw-.5*\ft});
\coordinate (-liquid-end) at ({\fa+\fs}:{.5*\fw-.5*\ft});
\end{scope}

\end{scope}
}},pics/liquid ring/.default={},
pics/physics liquid ring/.style={/tikz/pics/liquid ring={#1}},pics/physics liquid ring/.default={}}
\tikzphysics@registeranchors{physicsliquidring}{origin,center,bottom,top,left,right,liquid-start,liquid-end}
\tikzphysics@registerdisplayname{physicsliquidring}{liquid ring diagram}
\tikzphysics@registerkeydefaults{physicsliquidring}{fluid width/3.5cm,fluid tube width/.4cm,fluid angle/225,fluid sweep/70}

% Scoped geometry names do not redefine native TikZ keys.
\tikzset{fluid/.code={\pgfqkeys{/tikz/fluid}{#1}},/tikz/fluid/.search also={/tikz}}
\tikzset{/tikz/fluid/width/.style={/tikz/fluid width={#1}},/tikz/physics fluid width/.style={/tikz/fluid width={#1}},/tikz/fluid width/.value required}
\tikzset{/tikz/fluid/height/.style={/tikz/fluid height={#1}},/tikz/physics fluid height/.style={/tikz/fluid height={#1}},/tikz/fluid height/.value required}
\tikzset{/tikz/fluid/tube width/.style={/tikz/fluid tube width={#1}},/tikz/physics fluid tube width/.style={/tikz/fluid tube width={#1}},/tikz/fluid tube width/.value required}
\tikzset{/tikz/fluid/level/.style={/tikz/fluid level={#1}},/tikz/physics fluid level/.style={/tikz/fluid level={#1}},/tikz/fluid level/.value required}
\tikzset{/tikz/fluid/left level/.style={/tikz/fluid left level={#1}},/tikz/physics fluid left level/.style={/tikz/fluid left level={#1}},/tikz/fluid left level/.value required}
\tikzset{/tikz/fluid/right level/.style={/tikz/fluid right level={#1}},/tikz/physics fluid right level/.style={/tikz/fluid right level={#1}},/tikz/fluid right level/.value required}
\tikzset{/tikz/fluid/bend/.style={/tikz/fluid bend={#1}},/tikz/physics fluid bend/.style={/tikz/fluid bend={#1}},/tikz/fluid bend/.value required}
\tikzset{/tikz/fluid/angle/.style={/tikz/fluid angle={#1}},/tikz/physics fluid angle/.style={/tikz/fluid angle={#1}},/tikz/fluid angle/.value required}
\tikzset{/tikz/fluid/sweep/.style={/tikz/fluid sweep={#1}},/tikz/physics fluid sweep/.style={/tikz/fluid sweep={#1}},/tikz/fluid sweep/.value required}
\tikzset{/tikz/fluid/body label/.style={/tikz/fluid body label={#1}},/tikz/physics fluid body label/.style={/tikz/fluid body label={#1}},/tikz/fluid body label/.value required}
\tikzset{/tikz/fluid/left label/.style={/tikz/fluid left label={#1}},/tikz/physics fluid left label/.style={/tikz/fluid left label={#1}},/tikz/fluid left label/.value required}
\tikzset{/tikz/fluid/right label/.style={/tikz/fluid right label={#1}},/tikz/physics fluid right label/.style={/tikz/fluid right label={#1}},/tikz/fluid right label/.value required}
\tikzset{/tikz/fluid/dimension label/.style={/tikz/fluid dimension label={#1}},/tikz/physics fluid dimension label/.style={/tikz/fluid dimension label={#1}},/tikz/fluid dimension label/.value required}
\tikzset{/tikz/fluid/force label/.style={/tikz/fluid force label={#1}},/tikz/physics fluid force label/.style={/tikz/fluid force label={#1}},/tikz/fluid force label/.value required}
\tikzset{/tikz/fluid/volume label/.style={/tikz/fluid volume label={#1}},/tikz/physics fluid volume label/.style={/tikz/fluid volume label={#1}},/tikz/fluid volume label/.value required}
\tikzset{/tikz/fluid/pressure label/.style={/tikz/fluid pressure label={#1}},/tikz/physics fluid pressure label/.style={/tikz/fluid pressure label={#1}},/tikz/fluid pressure label/.value required}
\tikzset{/tikz/fluid/pressure increment label/.style={/tikz/fluid pressure increment label={#1}},/tikz/physics fluid pressure increment label/.style={/tikz/fluid pressure increment label={#1}},/tikz/fluid pressure increment label/.value required}
\tikzset{/tikz/fluid/angular velocity label/.style={/tikz/fluid angular velocity label={#1}},/tikz/physics fluid angular velocity label/.style={/tikz/fluid angular velocity label={#1}},/tikz/fluid angular velocity label/.value required}
\tikzset{/tikz/fluid/position label/.style={/tikz/fluid position label={#1}},/tikz/physics fluid position label/.style={/tikz/fluid position label={#1}},/tikz/fluid position label/.value required}
\tikzset{/tikz/fluid/horizontal axis label/.style={/tikz/fluid horizontal axis label={#1}},/tikz/physics fluid horizontal axis label/.style={/tikz/fluid horizontal axis label={#1}},/tikz/fluid horizontal axis label/.value required}
\tikzset{/tikz/fluid/vertical axis label/.style={/tikz/fluid vertical axis label={#1}},/tikz/physics fluid vertical axis label/.style={/tikz/fluid vertical axis label={#1}},/tikz/fluid vertical axis label/.value required}
\tikzset{/tikz/fluid/inlet velocity label/.style={/tikz/fluid inlet velocity label={#1}},/tikz/physics fluid inlet velocity label/.style={/tikz/fluid inlet velocity label={#1}},/tikz/fluid inlet velocity label/.value required}
\tikzset{/tikz/fluid/outlet velocity label/.style={/tikz/fluid outlet velocity label={#1}},/tikz/physics fluid outlet velocity label/.style={/tikz/fluid outlet velocity label={#1}},/tikz/fluid outlet velocity label/.value required}
\tikzset{/tikz/fluid/contact angle label/.style={/tikz/fluid contact angle label={#1}},/tikz/physics fluid contact angle label/.style={/tikz/fluid contact angle label={#1}},/tikz/fluid contact angle label/.value required}
\tikzset{/tikz/fluid/rise label/.style={/tikz/fluid rise label={#1}},/tikz/physics fluid rise label/.style={/tikz/fluid rise label={#1}},/tikz/fluid rise label/.value required}
\tikzset{/tikz/fluid/tension label/.style={/tikz/fluid tension label={#1}},/tikz/physics fluid tension label/.style={/tikz/fluid tension label={#1}},/tikz/fluid tension label/.value required}
\tikzset{/tikz/fluid/circumference force label/.style={/tikz/fluid circumference force label={#1}},/tikz/physics fluid circumference force label/.style={/tikz/fluid circumference force label={#1}},/tikz/fluid circumference force label/.value required}
\tikzset{/tikz/fluid/radius label/.style={/tikz/fluid radius label={#1}},/tikz/physics fluid radius label/.style={/tikz/fluid radius label={#1}},/tikz/fluid radius label/.value required}
\tikzset{every physics fluid outline/.style={},every fluid outline/.style={every physics fluid outline}}
\tikzset{every physics fluid liquid/.style={},every fluid liquid/.style={every physics fluid liquid}}
\tikzset{every physics fluid secondary liquid/.style={fill=gray!55},every fluid secondary liquid/.style={every physics fluid secondary liquid}}
\tikzset{every physics fluid label/.style={inner sep=.12em},every fluid label/.style={every physics fluid label}}
\tikzset{every physics fluid arrow/.style={>={Latex[length=.65em,width=.45em]}},every fluid arrow/.style={every physics fluid arrow}}
\tikzset{every physics fluid dimension/.style={every fluid arrow,<->},every fluid dimension/.style={every physics fluid dimension}}

%% Native node primitives. Fill paints the liquid, not the whole vessel.
%% The fill handler is local to a fluid node's option scope.
\tikzset{fluid node base/.code={%
  \tikzset{fill/.code={\def\tikzphysics@fluid@nodefill{##1}\def\tikzphysics@fluid@nodepattern{none}},fill/.default=gray!25,
    pattern/.code={\def\tikzphysics@fluid@nodepattern{##1}\def\tikzphysics@fluid@none{none}\ifx\tikzphysics@fluid@nodepattern\tikzphysics@fluid@none\def\tikzphysics@fluid@nodefill{none}\else\def\tikzphysics@fluid@nodefill{gray!25}\fi},pattern/.default=dots}%
  \tikzset{draw,fluid defaults,inner sep=.2em,outer sep=.5\pgflinewidth,
    physics debug setup}},
  every fluid node/.style={}}
\def\tikzphysics@fluid@nodegeometry{%
  \tikzphysics@fluid@positive\fw{\fwvalue}%
  \tikzphysics@fluid@positive\fh{\fhvalue}%
  \tikzphysics@fluid@positive\ft{\ftvalue}%
  \tikzphysics@fluid@fraction\fl{\flvalue}%
  \tikzphysics@fluid@fraction\fll{\fllvalue}%
  \tikzphysics@fluid@fraction\frl{\frlvalue}%
  \tikzphysics@fluid@scalar\fb{\fbvalue}%
  \tikzphysics@fluid@scalar\fa{\favalue}%
  \tikzphysics@fluid@scalar\fs{\fsvalue}%
  \pgfmathsetmacro\fw{max(\fw,\pgfkeysvalueof{/pgf/minimum width}/1cm,
    (\wd\pgfnodeparttextbox+2*\pgfkeysvalueof{/pgf/inner xsep})/1cm)}%
  \pgfmathsetmacro\fh{max(\fh,\pgfkeysvalueof{/pgf/minimum height}/1cm,
    (\ht\pgfnodeparttextbox+\dp\pgfnodeparttextbox+2*\pgfkeysvalueof{/pgf/inner ysep})/1cm)}%
  \pgfmathsetmacro\fcap{min(.125*\fw,.15*\fh)}%
  \pgfmathsetmacro\fntextx{-.5*\wd\pgfnodeparttextbox/1cm}%
  \pgfmathsetmacro\fnbase{(-.5*\ht\pgfnodeparttextbox+.5*\dp\pgfnodeparttextbox)/1cm}%
  \pgfmathsetmacro\fnmid{\fnbase+.5ex/1cm}%
  \pgfmathsetmacro\fox{\pgfkeysvalueof{/pgf/outer xsep}/1cm}%
  \pgfmathsetmacro\foy{\pgfkeysvalueof{/pgf/outer ysep}/1cm}%
}
\def\tikzphysics@fluid@moveto#1#2{\pgfpathmoveto{\pgfpoint{(#1)*1cm}{(#2)*1cm}}}
\def\tikzphysics@fluid@lineto#1#2{\pgfpathlineto{\pgfpoint{(#1)*1cm}{(#2)*1cm}}}
\def\tikzphysics@fluid@curve#1#2#3#4#5#6{%
  \pgfpathcurveto{\pgfpoint{(#1)*1cm}{(#2)*1cm}}{\pgfpoint{(#3)*1cm}{(#4)*1cm}}{\pgfpoint{(#5)*1cm}{(#6)*1cm}}}
\def\tikzphysics@fluid@ellipse#1#2#3#4{%
  \pgfpathellipse{\pgfpoint{(#1)*1cm}{(#2)*1cm}}{\pgfpoint{(#3)*1cm}{0pt}}{\pgfpoint{0pt}{(#4)*1cm}}}
\def\tikzphysics@fluid@nodeorigin{%
  \tikzphysics@fluid@nodestate
  \pgftransformshift{\pgfpoint{-.5*\fw*1cm}{-.5*\fh*1cm}}}
\def\tikzphysics@fluid@nodepaint{%
  \def\tikzphysics@fluid@none{none}%
  \ifx\tikzphysics@fluid@nodefill\tikzphysics@fluid@none
    \pgfusepath{discard}%
  \else
    \ifx\tikzphysics@fluid@nodepattern\tikzphysics@fluid@none
      \pgfsetfillcolor{\tikzphysics@fluid@nodefill}%
    \else
      \pgfsetfillpattern{\tikzphysics@fluid@nodepattern}{\tikz@pattern@color}%
    \fi
    \pgfusepath{fill}%
  \fi}
\def\tikzphysics@fluid@tankoutline{%
  \tikzphysics@fluid@moveto{0}{\fh}
  \tikzphysics@fluid@lineto{0}{.08*\fh}
  \tikzphysics@fluid@curve{0}{0}{0}{0}{.08*\fw}{0}
  \tikzphysics@fluid@lineto{.92*\fw}{0}
  \tikzphysics@fluid@curve{\fw}{0}{\fw}{0}{\fw}{.08*\fh}
  \tikzphysics@fluid@lineto{\fw}{\fh}}

\pgfdeclareshape{physicsfluidtanknode}{
\savedmacro\tikzphysics@fluid@nodestate{%
  \tikzphysics@fluid@nodegeometry
\addtosavedmacro\fw
\addtosavedmacro\fh
\addtosavedmacro\ft
\addtosavedmacro\fl
\addtosavedmacro\fll
\addtosavedmacro\frl
\addtosavedmacro\fb
\addtosavedmacro\fa
\addtosavedmacro\fs
\addtosavedmacro\fcap
\addtosavedmacro\fntextx
\addtosavedmacro\fnbase
\addtosavedmacro\fnmid
\addtosavedmacro\fox
\addtosavedmacro\foy
\addtosavedmacro\tikzphysics@fluid@nodefill
\addtosavedmacro\tikzphysics@fluid@nodepattern
\addtosavedmacro\tikz@pattern@color
}
\anchor{center}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(0)*1cm}}
\anchor{north}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{south}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(0)*1cm}}
\anchor{west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(0)*1cm}}
\anchor{north east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{north west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{south east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{south west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{left-surface}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw)*1cm}{((\fll-.5)*\fh)*1cm}}
\anchor{right-surface}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw)*1cm}{((\frl-.5)*\fh)*1cm}}
\anchor{surface}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{((.5*(\fll+\frl)-.5)*\fh)*1cm}}
\anchor{text}{\tikzphysics@fluid@nodestate\pgfpoint{\fntextx*1cm}{\fnbase*1cm}}
\anchor{base}{\tikzphysics@fluid@nodestate\pgfpoint{0pt}{\fnbase*1cm}}
\anchor{base east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{\fnbase*1cm}}
\anchor{base west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{\fnbase*1cm}}
\anchor{mid}{\tikzphysics@fluid@nodestate\pgfpoint{0pt}{\fnmid*1cm}}
\anchor{mid east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{\fnmid*1cm}}
\anchor{mid west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{\fnmid*1cm}}
\anchorborder{\edef\fluidborderx{\the\pgf@x}\edef\fluidbordery{\the\pgf@y}%
  \tikzphysics@fluid@nodestate
  \pgfpointborderrectangle{\pgfpoint{\fluidborderx}{\fluidbordery}}{\pgfpoint{(.5*\fw+\fox)*1cm}{(.5*\fh+\foy)*1cm}}}
\behindbackgroundpath{\pgfscope\tikzphysics@fluid@nodeorigin
\tikzphysics@fluid@moveto{0}{\fll*\fh}\tikzphysics@fluid@lineto{0}{.08*\fh}\tikzphysics@fluid@curve{0}{0}{0}{0}{.08*\fw}{0}\tikzphysics@fluid@lineto{.92*\fw}{0}\tikzphysics@fluid@curve{\fw}{0}{\fw}{0}{\fw}{.08*\fh}\tikzphysics@fluid@lineto{\fw}{\frl*\fh}\pgfpathclose
\tikzphysics@fluid@nodepaint\endpgfscope}
\backgroundpath{\pgfscope\tikzphysics@fluid@nodeorigin
\tikzphysics@fluid@tankoutline
\tikzphysics@fluid@moveto{0}{\fll*\fh}\tikzphysics@fluid@lineto{\fw}{\frl*\fh}
\endpgfscope}
}
\tikzset{fluid tank/.style={fluid node base,fluid left level=.7,fluid right level=.7,shape=physicsfluidtanknode,physics logical shape=physicsfluidtanknode,every physics object,every fluid node,every fluid tank},physics fluid tank/.style={fluid tank}}
\tikzphysics@registerdisplayname{physicsfluidtanknode}{fluid tank}
\tikzphysics@registeranchors{physicsfluidtanknode}{center,north,south,east,west,north east,north west,south east,south west,left-surface,right-surface,surface}
\tikzphysics@registerkeydefaults{physicsfluidtanknode}{fluid width/3cm,fluid height/3cm,fluid left level/.7,fluid right level/.7}
\tikzset{pics/fluid tank diagram/.style={/tikz/pics/fluid tank={#1}},pics/fluid tank diagram/.default={},
  pics/physics fluid tank diagram/.style={/tikz/pics/fluid tank={#1}},pics/physics fluid tank diagram/.default={}}

\pgfdeclareshape{physicsmeniscusnode}{
\savedmacro\tikzphysics@fluid@nodestate{%
  \tikzphysics@fluid@nodegeometry
\pgfmathparse{\fl-abs(\fb)>=0 && \fl+abs(\fb)<=1?1:0}\ifnum\pgfmathresult=0 \PackageError{tikzphysics}{Meniscus leaves the vessel}{Reduce bend.}\fi
\addtosavedmacro\fw
\addtosavedmacro\fh
\addtosavedmacro\ft
\addtosavedmacro\fl
\addtosavedmacro\fll
\addtosavedmacro\frl
\addtosavedmacro\fb
\addtosavedmacro\fa
\addtosavedmacro\fs
\addtosavedmacro\fcap
\addtosavedmacro\fntextx
\addtosavedmacro\fnbase
\addtosavedmacro\fnmid
\addtosavedmacro\fox
\addtosavedmacro\foy
\addtosavedmacro\tikzphysics@fluid@nodefill
\addtosavedmacro\tikzphysics@fluid@nodepattern
\addtosavedmacro\tikz@pattern@color
}
\anchor{center}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(0)*1cm}}
\anchor{north}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{south}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(0)*1cm}}
\anchor{west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(0)*1cm}}
\anchor{north east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{north west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{south east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{south west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{left-surface}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw)*1cm}{((\fl-.5)*\fh)*1cm}}
\anchor{right-surface}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw)*1cm}{((\fl-.5)*\fh)*1cm}}
\anchor{surface}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{((\fl-.75*\fb-.5)*\fh)*1cm}}
\anchor{text}{\tikzphysics@fluid@nodestate\pgfpoint{\fntextx*1cm}{\fnbase*1cm}}
\anchor{base}{\tikzphysics@fluid@nodestate\pgfpoint{0pt}{\fnbase*1cm}}
\anchor{base east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{\fnbase*1cm}}
\anchor{base west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{\fnbase*1cm}}
\anchor{mid}{\tikzphysics@fluid@nodestate\pgfpoint{0pt}{\fnmid*1cm}}
\anchor{mid east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{\fnmid*1cm}}
\anchor{mid west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{\fnmid*1cm}}
\anchorborder{\edef\fluidborderx{\the\pgf@x}\edef\fluidbordery{\the\pgf@y}%
  \tikzphysics@fluid@nodestate
  \pgfpointborderrectangle{\pgfpoint{\fluidborderx}{\fluidbordery}}{\pgfpoint{(.5*\fw+\fox)*1cm}{(.5*\fh+\foy)*1cm}}}
\behindbackgroundpath{\pgfscope\tikzphysics@fluid@nodeorigin
\tikzphysics@fluid@moveto{0}{0}\tikzphysics@fluid@lineto{\fw}{0}\tikzphysics@fluid@lineto{\fw}{\fl*\fh}\tikzphysics@fluid@curve{.67*\fw}{(\fl-\fb)*\fh}{.33*\fw}{(\fl-\fb)*\fh}{0}{\fl*\fh}\pgfpathclose
\tikzphysics@fluid@nodepaint\endpgfscope}
\backgroundpath{\pgfscope\tikzphysics@fluid@nodeorigin
\tikzphysics@fluid@moveto{0}{\fh}\tikzphysics@fluid@lineto{0}{0}\tikzphysics@fluid@lineto{\fw}{0}\tikzphysics@fluid@lineto{\fw}{\fh}\tikzphysics@fluid@moveto{0}{\fl*\fh}\tikzphysics@fluid@curve{.33*\fw}{(\fl-\fb)*\fh}{.67*\fw}{(\fl-\fb)*\fh}{\fw}{\fl*\fh}
\endpgfscope}
}
\tikzset{meniscus/.style={fluid node base,fluid width=1.2cm,fluid height=2.7cm,fluid level=.7,fluid bend=.2,shape=physicsmeniscusnode,physics logical shape=physicsmeniscusnode,every physics object,every fluid node,every meniscus},physics meniscus/.style={meniscus}}
\tikzphysics@registerdisplayname{physicsmeniscusnode}{meniscus}
\tikzphysics@registeranchors{physicsmeniscusnode}{center,north,south,east,west,north east,north west,south east,south west,left-surface,right-surface,surface}
\tikzphysics@registerkeydefaults{physicsmeniscusnode}{fluid width/1.2cm,fluid height/2.7cm,fluid level/.7,fluid bend/.2}
\tikzset{pics/meniscus diagram/.style={/tikz/pics/meniscus={#1}},pics/meniscus diagram/.default={},
  pics/physics meniscus diagram/.style={/tikz/pics/meniscus={#1}},pics/physics meniscus diagram/.default={}}

\pgfdeclareshape{physicsrotatingfluidnode}{
\savedmacro\tikzphysics@fluid@nodestate{%
  \tikzphysics@fluid@nodegeometry
\pgfmathparse{\fb>=0 && \fl+\fb<=1?1:0}\ifnum\pgfmathresult=0 \PackageError{tikzphysics}{Rotating surface leaves the vessel}{Reduce bend.}\fi
\addtosavedmacro\fw
\addtosavedmacro\fh
\addtosavedmacro\ft
\addtosavedmacro\fl
\addtosavedmacro\fll
\addtosavedmacro\frl
\addtosavedmacro\fb
\addtosavedmacro\fa
\addtosavedmacro\fs
\addtosavedmacro\fcap
\addtosavedmacro\fntextx
\addtosavedmacro\fnbase
\addtosavedmacro\fnmid
\addtosavedmacro\fox
\addtosavedmacro\foy
\addtosavedmacro\tikzphysics@fluid@nodefill
\addtosavedmacro\tikzphysics@fluid@nodepattern
\addtosavedmacro\tikz@pattern@color
}
\anchor{center}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(0)*1cm}}
\anchor{north}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{south}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(0)*1cm}}
\anchor{west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(0)*1cm}}
\anchor{north east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{north west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{south east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{south west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{left-surface}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw)*1cm}{((\fl+\fb-.5)*\fh)*1cm}}
\anchor{right-surface}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw)*1cm}{((\fl+\fb-.5)*\fh)*1cm}}
\anchor{surface}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{((\fl-.5)*\fh)*1cm}}
\anchor{text}{\tikzphysics@fluid@nodestate\pgfpoint{\fntextx*1cm}{\fnbase*1cm}}
\anchor{base}{\tikzphysics@fluid@nodestate\pgfpoint{0pt}{\fnbase*1cm}}
\anchor{base east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{\fnbase*1cm}}
\anchor{base west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{\fnbase*1cm}}
\anchor{mid}{\tikzphysics@fluid@nodestate\pgfpoint{0pt}{\fnmid*1cm}}
\anchor{mid east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{\fnmid*1cm}}
\anchor{mid west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{\fnmid*1cm}}
\anchorborder{\edef\fluidborderx{\the\pgf@x}\edef\fluidbordery{\the\pgf@y}%
  \tikzphysics@fluid@nodestate
  \pgfpointborderrectangle{\pgfpoint{\fluidborderx}{\fluidbordery}}{\pgfpoint{(.5*\fw+\fox)*1cm}{(.5*\fh+\foy)*1cm}}}
\behindbackgroundpath{\pgfscope\tikzphysics@fluid@nodeorigin
\tikzphysics@fluid@moveto{0}{0}\tikzphysics@fluid@lineto{\fw}{0}\tikzphysics@fluid@lineto{\fw}{(\fl+\fb)*\fh}\tikzphysics@fluid@curve{.6666667*\fw}{(\fl-\fb/3)*\fh}{.3333333*\fw}{(\fl-\fb/3)*\fh}{0}{(\fl+\fb)*\fh}\pgfpathclose
\tikzphysics@fluid@nodepaint\endpgfscope}
\backgroundpath{\pgfscope\tikzphysics@fluid@nodeorigin
\tikzphysics@fluid@moveto{0}{\fh}\tikzphysics@fluid@lineto{0}{0}\tikzphysics@fluid@lineto{\fw}{0}\tikzphysics@fluid@lineto{\fw}{\fh}\tikzphysics@fluid@moveto{0}{(\fl+\fb)*\fh}\tikzphysics@fluid@curve{.3333333*\fw}{(\fl-\fb/3)*\fh}{.6666667*\fw}{(\fl-\fb/3)*\fh}{\fw}{(\fl+\fb)*\fh}
\endpgfscope}
}
\tikzset{rotating fluid/.style={fluid node base,fluid width=3cm,fluid height=3.5cm,fluid level=.5,fluid bend=.35,shape=physicsrotatingfluidnode,physics logical shape=physicsrotatingfluidnode,every physics object,every fluid node,every rotating fluid},physics rotating fluid/.style={rotating fluid}}
\tikzphysics@registerdisplayname{physicsrotatingfluidnode}{rotating fluid}
\tikzphysics@registeranchors{physicsrotatingfluidnode}{center,north,south,east,west,north east,north west,south east,south west,left-surface,right-surface,surface}
\tikzphysics@registerkeydefaults{physicsrotatingfluidnode}{fluid width/3cm,fluid height/3.5cm,fluid level/.5,fluid bend/.35}
\tikzset{pics/rotating fluid diagram/.style={/tikz/pics/rotating fluid={#1}},pics/rotating fluid diagram/.default={},
  pics/physics rotating fluid diagram/.style={/tikz/pics/rotating fluid={#1}},pics/physics rotating fluid diagram/.default={}}

\pgfdeclareshape{physicsfluidcylindernode}{
\savedmacro\tikzphysics@fluid@nodestate{%
  \tikzphysics@fluid@nodegeometry
\addtosavedmacro\fw
\addtosavedmacro\fh
\addtosavedmacro\ft
\addtosavedmacro\fl
\addtosavedmacro\fll
\addtosavedmacro\frl
\addtosavedmacro\fb
\addtosavedmacro\fa
\addtosavedmacro\fs
\addtosavedmacro\fcap
\addtosavedmacro\fntextx
\addtosavedmacro\fnbase
\addtosavedmacro\fnmid
\addtosavedmacro\fox
\addtosavedmacro\foy
\addtosavedmacro\tikzphysics@fluid@nodefill
\addtosavedmacro\tikzphysics@fluid@nodepattern
\addtosavedmacro\tikz@pattern@color
}
\anchor{center}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(0)*1cm}}
\anchor{north}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{south}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(0)*1cm}}
\anchor{west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(0)*1cm}}
\anchor{north east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{north west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{south east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{south west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{left-surface}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{((\fl-.5)*(\fh-2*\fcap))*1cm}}
\anchor{right-surface}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{((\fl-.5)*(\fh-2*\fcap))*1cm}}
\anchor{surface}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{((\fl-.5)*(\fh-2*\fcap))*1cm}}
\anchor{text}{\tikzphysics@fluid@nodestate\pgfpoint{\fntextx*1cm}{\fnbase*1cm}}
\anchor{base}{\tikzphysics@fluid@nodestate\pgfpoint{0pt}{\fnbase*1cm}}
\anchor{base east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{\fnbase*1cm}}
\anchor{base west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{\fnbase*1cm}}
\anchor{mid}{\tikzphysics@fluid@nodestate\pgfpoint{0pt}{\fnmid*1cm}}
\anchor{mid east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{\fnmid*1cm}}
\anchor{mid west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{\fnmid*1cm}}
\anchorborder{\edef\fluidborderx{\the\pgf@x}\edef\fluidbordery{\the\pgf@y}%
  \tikzphysics@fluid@nodestate
  \pgfpointborderrectangle{\pgfpoint{\fluidborderx}{\fluidbordery}}{\pgfpoint{(.5*\fw+\fox)*1cm}{(.5*\fh+\foy)*1cm}}}
\behindbackgroundpath{\pgfscope\tikzphysics@fluid@nodeorigin
\tikzphysics@fluid@moveto{0}{\fcap}\tikzphysics@fluid@curve{0}{0}{\fw}{0}{\fw}{\fcap}\tikzphysics@fluid@lineto{\fw}{\fl*(\fh-2*\fcap)+\fcap}\tikzphysics@fluid@curve{\fw}{\fl*(\fh-2*\fcap)+2*\fcap}{0}{\fl*(\fh-2*\fcap)+2*\fcap}{0}{\fl*(\fh-2*\fcap)+\fcap}\pgfpathclose
\tikzphysics@fluid@nodepaint\endpgfscope}
\backgroundpath{\pgfscope\tikzphysics@fluid@nodeorigin
\tikzphysics@fluid@ellipse{.5*\fw}{\fh-\fcap}{.5*\fw}{\fcap}\tikzphysics@fluid@moveto{0}{\fh-\fcap}\tikzphysics@fluid@lineto{0}{\fcap}\pgfpatharc{180}{360}{.5*\fw*1cm and \fcap*1cm}\tikzphysics@fluid@lineto{\fw}{\fh-\fcap}\tikzphysics@fluid@ellipse{.5*\fw}{\fl*(\fh-2*\fcap)+\fcap}{.5*\fw}{\fcap}
\endpgfscope}
}
\tikzset{fluid cylinder/.style={fluid node base,fluid width=1.6cm,fluid height=3.2cm,shape=physicsfluidcylindernode,physics logical shape=physicsfluidcylindernode,every physics object,every fluid node,every fluid cylinder},physics fluid cylinder/.style={fluid cylinder}}
\tikzphysics@registerdisplayname{physicsfluidcylindernode}{fluid cylinder}
\tikzphysics@registeranchors{physicsfluidcylindernode}{center,north,south,east,west,north east,north west,south east,south west,left-surface,right-surface,surface}
\tikzphysics@registerkeydefaults{physicsfluidcylindernode}{fluid width/1.6cm,fluid height/3.2cm,fluid level/.65}
\tikzset{pics/fluid cylinder diagram/.style={/tikz/pics/fluid cylinder={#1}},pics/fluid cylinder diagram/.default={},
  pics/physics fluid cylinder diagram/.style={/tikz/pics/fluid cylinder={#1}},pics/physics fluid cylinder diagram/.default={}}

\pgfdeclareshape{physicspressureelementnode}{
\savedmacro\tikzphysics@fluid@nodestate{%
  \tikzphysics@fluid@nodegeometry
\addtosavedmacro\fw
\addtosavedmacro\fh
\addtosavedmacro\ft
\addtosavedmacro\fl
\addtosavedmacro\fll
\addtosavedmacro\frl
\addtosavedmacro\fb
\addtosavedmacro\fa
\addtosavedmacro\fs
\addtosavedmacro\fcap
\addtosavedmacro\fntextx
\addtosavedmacro\fnbase
\addtosavedmacro\fnmid
\addtosavedmacro\fox
\addtosavedmacro\foy
\addtosavedmacro\tikzphysics@fluid@nodefill
\addtosavedmacro\tikzphysics@fluid@nodepattern
\addtosavedmacro\tikz@pattern@color
}
\anchor{center}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(0)*1cm}}
\anchor{north}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{south}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(0)*1cm}}
\anchor{west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(0)*1cm}}
\anchor{north east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{north west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{south east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{south west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{inlet}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw)*1cm}{(0)*1cm}}
\anchor{outlet}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw)*1cm}{(0)*1cm}}
\anchor{text}{\tikzphysics@fluid@nodestate\pgfpoint{\fntextx*1cm}{\fnbase*1cm}}
\anchor{base}{\tikzphysics@fluid@nodestate\pgfpoint{0pt}{\fnbase*1cm}}
\anchor{base east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{\fnbase*1cm}}
\anchor{base west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{\fnbase*1cm}}
\anchor{mid}{\tikzphysics@fluid@nodestate\pgfpoint{0pt}{\fnmid*1cm}}
\anchor{mid east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{\fnmid*1cm}}
\anchor{mid west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{\fnmid*1cm}}
\anchorborder{\edef\fluidborderx{\the\pgf@x}\edef\fluidbordery{\the\pgf@y}%
  \tikzphysics@fluid@nodestate
  \pgfpointborderrectangle{\pgfpoint{\fluidborderx}{\fluidbordery}}{\pgfpoint{(.5*\fw+\fox)*1cm}{(.5*\fh+\foy)*1cm}}}
\behindbackgroundpath{\pgfscope\tikzphysics@fluid@nodeorigin
\tikzphysics@fluid@moveto{\fcap}{0}\tikzphysics@fluid@lineto{\fw-\fcap}{0}\tikzphysics@fluid@lineto{\fw-\fcap}{\fh}\tikzphysics@fluid@lineto{\fcap}{\fh}\pgfpathclose\tikzphysics@fluid@ellipse{\fcap}{.5*\fh}{\fcap}{.5*\fh}\tikzphysics@fluid@ellipse{\fw-\fcap}{.5*\fh}{\fcap}{.5*\fh}
\tikzphysics@fluid@nodepaint\endpgfscope}
\backgroundpath{\pgfscope\tikzphysics@fluid@nodeorigin
\tikzphysics@fluid@ellipse{\fcap}{.5*\fh}{\fcap}{.5*\fh}\tikzphysics@fluid@ellipse{\fw-\fcap}{.5*\fh}{\fcap}{.5*\fh}\tikzphysics@fluid@moveto{\fcap}{0}\tikzphysics@fluid@lineto{\fw-\fcap}{0}\tikzphysics@fluid@moveto{\fcap}{\fh}\tikzphysics@fluid@lineto{\fw-\fcap}{\fh}
\endpgfscope}
}
\tikzset{pressure element/.style={fluid node base,fluid width=2cm,fluid height=.65cm,shape=physicspressureelementnode,physics logical shape=physicspressureelementnode,every physics object,every fluid node,every pressure element},physics pressure element/.style={pressure element}}
\tikzphysics@registerdisplayname{physicspressureelementnode}{pressure element}
\tikzphysics@registeranchors{physicspressureelementnode}{center,north,south,east,west,north east,north west,south east,south west,inlet,outlet}
\tikzphysics@registerkeydefaults{physicspressureelementnode}{fluid width/2cm,fluid height/.65cm}
\tikzset{pics/pressure element diagram/.style={/tikz/pics/pressure element={#1}},pics/pressure element diagram/.default={},
  pics/physics pressure element diagram/.style={/tikz/pics/pressure element={#1}},pics/physics pressure element diagram/.default={}}

\pgfdeclareshape{physicsflowtubenode}{
\savedmacro\tikzphysics@fluid@nodestate{%
  \tikzphysics@fluid@nodegeometry
\addtosavedmacro\fw
\addtosavedmacro\fh
\addtosavedmacro\ft
\addtosavedmacro\fl
\addtosavedmacro\fll
\addtosavedmacro\frl
\addtosavedmacro\fb
\addtosavedmacro\fa
\addtosavedmacro\fs
\addtosavedmacro\fcap
\addtosavedmacro\fntextx
\addtosavedmacro\fnbase
\addtosavedmacro\fnmid
\addtosavedmacro\fox
\addtosavedmacro\foy
\addtosavedmacro\tikzphysics@fluid@nodefill
\addtosavedmacro\tikzphysics@fluid@nodepattern
\addtosavedmacro\tikz@pattern@color
}
\anchor{center}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(0)*1cm}}
\anchor{north}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{south}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(0)*1cm}}
\anchor{west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(0)*1cm}}
\anchor{north east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{north west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{south east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{south west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{inlet}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw)*1cm}{(0)*1cm}}
\anchor{outlet}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw)*1cm}{((\fb-.225)*\fh)*1cm}}
\anchor{text}{\tikzphysics@fluid@nodestate\pgfpoint{\fntextx*1cm}{\fnbase*1cm}}
\anchor{base}{\tikzphysics@fluid@nodestate\pgfpoint{0pt}{\fnbase*1cm}}
\anchor{base east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{\fnbase*1cm}}
\anchor{base west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{\fnbase*1cm}}
\anchor{mid}{\tikzphysics@fluid@nodestate\pgfpoint{0pt}{\fnmid*1cm}}
\anchor{mid east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{\fnmid*1cm}}
\anchor{mid west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{\fnmid*1cm}}
\anchorborder{\edef\fluidborderx{\the\pgf@x}\edef\fluidbordery{\the\pgf@y}%
  \tikzphysics@fluid@nodestate
  \pgfpointborderrectangle{\pgfpoint{\fluidborderx}{\fluidbordery}}{\pgfpoint{(.5*\fw+\fox)*1cm}{(.5*\fh+\foy)*1cm}}}
\behindbackgroundpath{\pgfscope\tikzphysics@fluid@nodeorigin
\tikzphysics@fluid@moveto{0}{0}\tikzphysics@fluid@curve{.35*\fw}{\fb*\fh}{.65*\fw}{-\fb*\fh}{\fw}{\fb*\fh}\tikzphysics@fluid@lineto{\fw}{(\fb+.55)*\fh}\tikzphysics@fluid@curve{.65*\fw}{(.55-\fb)*\fh}{.35*\fw}{(1+\fb)*\fh}{0}{\fh}\pgfpathclose
\tikzphysics@fluid@nodepaint\endpgfscope}
\backgroundpath{\pgfscope\tikzphysics@fluid@nodeorigin
\tikzphysics@fluid@moveto{0}{0}\tikzphysics@fluid@curve{.35*\fw}{\fb*\fh}{.65*\fw}{-\fb*\fh}{\fw}{\fb*\fh}\tikzphysics@fluid@moveto{0}{\fh}\tikzphysics@fluid@curve{.35*\fw}{(1+\fb)*\fh}{.65*\fw}{(.55-\fb)*\fh}{\fw}{(\fb+.55)*\fh}\tikzphysics@fluid@moveto{0}{0}\tikzphysics@fluid@lineto{0}{\fh}\tikzphysics@fluid@moveto{\fw}{\fb*\fh}\tikzphysics@fluid@lineto{\fw}{(\fb+.55)*\fh}
\endpgfscope}
}
\tikzset{flow tube/.style={fluid node base,fluid width=5cm,fluid height=1.3cm,fluid bend=.45,shape=physicsflowtubenode,physics logical shape=physicsflowtubenode,every physics object,every fluid node,every flow tube},physics flow tube/.style={flow tube}}
\tikzphysics@registerdisplayname{physicsflowtubenode}{flow tube}
\tikzphysics@registeranchors{physicsflowtubenode}{center,north,south,east,west,north east,north west,south east,south west,inlet,outlet}
\tikzphysics@registerkeydefaults{physicsflowtubenode}{fluid width/5cm,fluid height/1.3cm,fluid bend/.45}
\tikzset{pics/flow tube diagram/.style={/tikz/pics/flow tube={#1}},pics/flow tube diagram/.default={},
  pics/physics flow tube diagram/.style={/tikz/pics/flow tube={#1}},pics/physics flow tube diagram/.default={}}

\pgfdeclareshape{physicsliquidringnode}{
\savedmacro\tikzphysics@fluid@nodestate{%
  \tikzphysics@fluid@nodegeometry
\pgfmathparse{\ft<.5*\fw && \fs>0 && \fs<=360?1:0}\ifnum\pgfmathresult=0 \PackageError{tikzphysics}{Invalid liquid ring geometry}{Reduce thickness or sweep.}\fi
\pgfmathsetmacro\fh{\fw}
\addtosavedmacro\fw
\addtosavedmacro\fh
\addtosavedmacro\ft
\addtosavedmacro\fl
\addtosavedmacro\fll
\addtosavedmacro\frl
\addtosavedmacro\fb
\addtosavedmacro\fa
\addtosavedmacro\fs
\addtosavedmacro\fcap
\addtosavedmacro\fntextx
\addtosavedmacro\fnbase
\addtosavedmacro\fnmid
\addtosavedmacro\fox
\addtosavedmacro\foy
\addtosavedmacro\tikzphysics@fluid@nodefill
\addtosavedmacro\tikzphysics@fluid@nodepattern
\addtosavedmacro\tikz@pattern@color
}
\anchor{center}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(0)*1cm}}
\anchor{north}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{south}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(0)*1cm}}
\anchor{west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(0)*1cm}}
\anchor{north east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{north west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{south east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{south west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{liquid-start}{\tikzphysics@fluid@nodestate\pgfpoint{((.5*\fw-.5*\ft)*cos(\fa))*1cm}{((.5*\fw-.5*\ft)*sin(\fa))*1cm}}
\anchor{liquid-end}{\tikzphysics@fluid@nodestate\pgfpoint{((.5*\fw-.5*\ft)*cos(\fa+\fs))*1cm}{((.5*\fw-.5*\ft)*sin(\fa+\fs))*1cm}}
\anchor{text}{\tikzphysics@fluid@nodestate\pgfpoint{\fntextx*1cm}{\fnbase*1cm}}
\anchor{base}{\tikzphysics@fluid@nodestate\pgfpoint{0pt}{\fnbase*1cm}}
\anchor{base east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{\fnbase*1cm}}
\anchor{base west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{\fnbase*1cm}}
\anchor{mid}{\tikzphysics@fluid@nodestate\pgfpoint{0pt}{\fnmid*1cm}}
\anchor{mid east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{\fnmid*1cm}}
\anchor{mid west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{\fnmid*1cm}}
\anchorborder{\edef\fluidborderx{\the\pgf@x}\edef\fluidbordery{\the\pgf@y}%
  \tikzphysics@fluid@nodestate
  \pgfpointborderellipse{\pgfpoint{\fluidborderx}{\fluidbordery}}{\pgfpoint{(.5*\fw+\fox)*1cm}{(.5*\fh+\foy)*1cm}}}
\behindbackgroundpath{\pgfscope\tikzphysics@fluid@nodeorigin
\tikzphysics@fluid@moveto{.5*\fw+.5*\fw*cos(\fa)}{.5*\fh+.5*\fw*sin(\fa)}\pgfpatharc{\fa}{\fa+\fs}{.5*\fw*1cm}\tikzphysics@fluid@lineto{.5*\fw+(.5*\fw-\ft)*cos(\fa+\fs)}{.5*\fh+(.5*\fw-\ft)*sin(\fa+\fs)}\pgfpatharc{\fa+\fs}{\fa}{(.5*\fw-\ft)*1cm}\pgfpathclose
\tikzphysics@fluid@nodepaint\endpgfscope}
\backgroundpath{\pgfscope\tikzphysics@fluid@nodeorigin
\tikzphysics@fluid@ellipse{.5*\fw}{.5*\fh}{.5*\fw}{.5*\fw}\tikzphysics@fluid@ellipse{.5*\fw}{.5*\fh}{.5*\fw-\ft}{.5*\fw-\ft}\tikzphysics@fluid@moveto{.5*\fw+(.5*\fw-\ft)*cos(\fa)}{.5*\fh+(.5*\fw-\ft)*sin(\fa)}\tikzphysics@fluid@lineto{.5*\fw+.5*\fw*cos(\fa)}{.5*\fh+.5*\fw*sin(\fa)}\tikzphysics@fluid@moveto{.5*\fw+(.5*\fw-\ft)*cos(\fa+\fs)}{.5*\fh+(.5*\fw-\ft)*sin(\fa+\fs)}\tikzphysics@fluid@lineto{.5*\fw+.5*\fw*cos(\fa+\fs)}{.5*\fh+.5*\fw*sin(\fa+\fs)}
\endpgfscope}
}
\tikzset{liquid ring/.style={fluid node base,fluid width=3.5cm,fluid height=3.5cm,fluid tube width=.4cm,fluid angle=225,fluid sweep=70,shape=physicsliquidringnode,physics logical shape=physicsliquidringnode,every physics object,every fluid node,every liquid ring},physics liquid ring/.style={liquid ring}}
\tikzphysics@registerdisplayname{physicsliquidringnode}{liquid ring}
\tikzphysics@registeranchors{physicsliquidringnode}{center,north,south,east,west,north east,north west,south east,south west,liquid-start,liquid-end}
\tikzphysics@registerkeydefaults{physicsliquidringnode}{fluid width/3.5cm,fluid tube width/.4cm,fluid angle/225,fluid sweep/70}
\tikzset{pics/liquid ring diagram/.style={/tikz/pics/liquid ring={#1}},pics/liquid ring diagram/.default={},
  pics/physics liquid ring diagram/.style={/tikz/pics/liquid ring={#1}},pics/physics liquid ring diagram/.default={}}

\pgfdeclareshape{physicsutubenode}{
\savedmacro\tikzphysics@fluid@nodestate{%
  \tikzphysics@fluid@nodegeometry
\tikzphysics@fluid@tubecheck
\addtosavedmacro\fw
\addtosavedmacro\fh
\addtosavedmacro\ft
\addtosavedmacro\fl
\addtosavedmacro\fll
\addtosavedmacro\frl
\addtosavedmacro\fb
\addtosavedmacro\fa
\addtosavedmacro\fs
\addtosavedmacro\fcap
\addtosavedmacro\fntextx
\addtosavedmacro\fnbase
\addtosavedmacro\fnmid
\addtosavedmacro\fox
\addtosavedmacro\foy
\addtosavedmacro\tikzphysics@fluid@nodefill
\addtosavedmacro\tikzphysics@fluid@nodepattern
\addtosavedmacro\tikz@pattern@color
}
\anchor{center}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(0)*1cm}}
\anchor{north}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{south}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(0)*1cm}}
\anchor{west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(0)*1cm}}
\anchor{north east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{north west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(.5*\fh+\foy)*1cm}}
\anchor{south east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{south west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{(-.5*\fh-\foy)*1cm}}
\anchor{left-surface}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw+.5*\ft)*1cm}{((\fll-.5)*\fh)*1cm}}
\anchor{right-surface}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw-.5*\ft)*1cm}{((\frl-.5)*\fh)*1cm}}
\anchor{surface}{\tikzphysics@fluid@nodestate\pgfpoint{(0)*1cm}{((.5*(\fll+\frl)-.5)*\fh)*1cm}}
\anchor{text}{\tikzphysics@fluid@nodestate\pgfpoint{\fntextx*1cm}{\fnbase*1cm}}
\anchor{base}{\tikzphysics@fluid@nodestate\pgfpoint{0pt}{\fnbase*1cm}}
\anchor{base east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{\fnbase*1cm}}
\anchor{base west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{\fnbase*1cm}}
\anchor{mid}{\tikzphysics@fluid@nodestate\pgfpoint{0pt}{\fnmid*1cm}}
\anchor{mid east}{\tikzphysics@fluid@nodestate\pgfpoint{(.5*\fw+\fox)*1cm}{\fnmid*1cm}}
\anchor{mid west}{\tikzphysics@fluid@nodestate\pgfpoint{(-.5*\fw-\fox)*1cm}{\fnmid*1cm}}
\anchorborder{\edef\fluidborderx{\the\pgf@x}\edef\fluidbordery{\the\pgf@y}%
  \tikzphysics@fluid@nodestate
  \pgfpointborderrectangle{\pgfpoint{\fluidborderx}{\fluidbordery}}{\pgfpoint{(.5*\fw+\fox)*1cm}{(.5*\fh+\foy)*1cm}}}
\behindbackgroundpath{\pgfscope\tikzphysics@fluid@nodeorigin
\tikzphysics@fluid@moveto{0}{\fll*\fh}\tikzphysics@fluid@lineto{0}{.5*\fw}\pgfpatharc{180}{360}{.5*\fw*1cm}\tikzphysics@fluid@lineto{\fw}{\frl*\fh}\tikzphysics@fluid@lineto{\fw-\ft}{\frl*\fh}\tikzphysics@fluid@lineto{\fw-\ft}{.5*\fw}\pgfpatharc{0}{-180}{(.5*\fw-\ft)*1cm}\tikzphysics@fluid@lineto{\ft}{\fll*\fh}\pgfpathclose
\tikzphysics@fluid@nodepaint\endpgfscope}
\backgroundpath{\pgfscope\tikzphysics@fluid@nodeorigin
\tikzphysics@fluid@moveto{0}{\fh}\tikzphysics@fluid@lineto{0}{.5*\fw}\pgfpatharc{180}{360}{.5*\fw*1cm}\tikzphysics@fluid@lineto{\fw}{\fh}\tikzphysics@fluid@moveto{\ft}{\fh}\tikzphysics@fluid@lineto{\ft}{.5*\fw}\pgfpatharc{180}{360}{(.5*\fw-\ft)*1cm}\tikzphysics@fluid@lineto{\fw-\ft}{\fh}\tikzphysics@fluid@moveto{0}{\fll*\fh}\tikzphysics@fluid@lineto{\ft}{\fll*\fh}\tikzphysics@fluid@moveto{\fw-\ft}{\frl*\fh}\tikzphysics@fluid@lineto{\fw}{\frl*\fh}
\endpgfscope}
}
\tikzset{u tube/.style={fluid node base,fluid width=2cm,fluid height=4cm,fluid left level=.75,fluid right level=.55,shape=physicsutubenode,physics logical shape=physicsutubenode,every physics object,every fluid node,every u tube},physics u tube/.style={u tube}}
\tikzphysics@registerdisplayname{physicsutubenode}{u tube}
\tikzphysics@registeranchors{physicsutubenode}{center,north,south,east,west,north east,north west,south east,south west,left-surface,right-surface,surface}
\tikzphysics@registerkeydefaults{physicsutubenode}{fluid width/2cm,fluid height/4cm,fluid tube width/.3cm,fluid left level/.75,fluid right level/.55}
\tikzset{pics/u tube diagram/.style={/tikz/pics/u tube={#1}},pics/u tube diagram/.default={},
  pics/physics u tube diagram/.style={/tikz/pics/u tube={#1}},pics/physics u tube diagram/.default={}}

\makeatother
\endinput