Ébullition et pression (trompe à eau~water pump)

\documentclass{article}
\usepackage{pst-grad,multido}%
\input{random.tex}         % From Donald Arseneau (on macros/generic on CTAN)
% Manuel Luque : manuel.luque27@gmail.com
%  6 avril 2003
\definecolor{Bluea}{cmyk}{.2,0,0,0}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\def\Bouchon{%
  \psellipse[linewidth=1.5\pslinewidth](0,0.2)(0.6,0.1)
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\newcommand\erlen{%
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    \pspolygon[linestyle=none,linearc=0.2](-0.6,3.2)(-0.4,3)(-0.4,2)(-1.2,0)(1.2,0)(0.4,2)%
            (0.4,3)(0.6,3.2)}
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      \pscurve(-2,0.9)(-1.75,1)(-1.5,0.9)(-1.25,1)(-1,0.9)
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            \BILLES
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    \pspolygon[linearc=0.05,fillstyle=solid,fillcolor=red](0.05,3)(0.05,-1.2)
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\makeatletter
\newdimen\BX
\newdimen\BY
\newdimen\RAYONBULLE
\makeatletter
\newcommand{\BILLES}[1][50]{%
\multido{\IBULLE=1+1}{#1}{%
\setrandim{\BX}{-1.5\psunit}{1.5\psunit}
\setrandim{\BY}{0\psunit}{1\psunit}
\pst@dimh=\BY
\setrandim{\RAYONBULLE}{0.01\psunit}{0.1\psunit}
\ifdim\BY>2\psunit \multiply \RAYONBULLE by 3
\else
    \ifdim\BY < 2\psunit \ifdim\BY >1\psunit \multiply \RAYONBULLE by 2\fi
    \else
     \multiply \RAYONBULLE by 1
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\fi
\rput(0,0){%
\pscircle[style=BilleThreeD](\BX,\BY){\RAYONBULLE}}}}

\newpsstyle{BilleThreeD}{linestyle=none,fillstyle=gradient,gradmidpoint=0,gradend=white,GradientCircle}

\pagestyle{empty}
\begin{document}
\begin{center}
\begin{pspicture}(-5,0)(5,6)
\rput(-2.2,4){\manometre}
\erlen
\rput(0.2,3){\thermometre}
\rput(0,3){\Bouchon}
\psline{->}(1.5,2.5)(2.5,2.5)
%\uput[0](2.5,2.5){vers trompe \`a eau}
\end{pspicture}
\end{center}
\end{document}