# tikz: azeotropic graph [closed]

Do you know an example, even a minimal one, in order to draw the graph of an azeotropic mixture with tikz?

## closed as off-topic by Andrew Swann, user156344, hpekristiansen, Raaja, Phelype OleinikMay 16 at 10:21

• This question does not fall within the scope of TeX, LaTeX or related typesetting systems as defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.

• Do you have the data? This looks like a job for pgfplot. – Oleg Lobachev Apr 21 at 10:31
• I only need some generic curves, no precise data are needed – user3204810 Apr 21 at 10:33
• You should be able to just use pgfplot and plot a couple of polynomial approximations, fitting the polynomial is off topic here. – David Carlisle Apr 21 at 12:00
• I'm voting to close this question as off-topic because this is a just-do-it-for-me question – user156344 May 16 at 7:34

This is to give you a start.

\documentclass[tikz,border=3.14mm]{standalone}
\begin{document}
\begin{tikzpicture}
\draw (0,3) -- (0,0) node[below] {$0$} -- (3,0) node[midway,below] {$\chi_A$}
node[below] {$1$} -- (3,3);
\draw[blue,thick] (0,2) coordinate(L1) node[black,left] {$T_B$}
to[out=-60,in=-135] coordinate[pos=0.65] (p1)
(3,1) coordinate(R1) node[black,right] {$T_A$} ;
\draw[red,thick,looseness=0.8] (L1) to[out=10,in=170] (p1) node[below,black] {$T_\mathrm{min}$}
to[out=-10,in=160] (R1);
\path[font=\sffamily] (1,0.5) node {liquido} (2,2.5) node {vapore};
%
\begin{scope}[xshift=4.5cm]
\draw (0,3) -- (0,0) node[below] {$0$} -- (3,0) node[midway,below] {$\chi_A$}
node[below] {$1$} -- (3,3);
\draw[blue,thick] (0,2) coordinate(L2) node[black,left] {$T_B$}
to[out=-20,in=180,looseness=2] ++ (1,0.3) coordinate (p2) to[out=00,in=135]
++(1,-1.25)  to[out=-45,in=160]
(3,1) coordinate(R2) node[black,right] {$T_A$} ;
\draw[red,thick,looseness=0.8] (L2) to[out=30,in=180] (p2)
node[above,black] {$T_\mathrm{max}$}
to[out=0,in=130] (R2);
\path[font=\sffamily] (1,0.5) node {liquido} (2,2.5) node {vapore};
\end{scope}
\end{tikzpicture}
\end{document}