\documentclass[convert=true,convert={convertexe={convert},density=1200,outext=.png}]{standalone}

\input{figsDefs.tex}

\begin{document}
	
\begin{tikzpicture}
	\node [ellipse,draw] (s) at (0,0) {solide} ;
	\node [ellipse,draw] (l) at (3.46,3.5) {liquide} ;
	\node [ellipse,draw] (g) at (6.92,0) {gaz} ;
	%\node [ellipse,draw] (g) at (3.46,-2) {gaz} ;
	
	\draw[<-] (s) .. controls +(up:1cm) and +(left:2cm) .. node[above,sloped] 
	{solidification} (l);
	%\path[->] (l) edge node[above,sloped] {solidification} (s);
	\draw[<-] (l) .. controls +(-135:1cm) and +(20:2cm) .. node[above,sloped] 
	{fusion} (s);
	
	\draw[<-] (g) .. controls +(up:1cm) and +(right:2cm) .. node[above,sloped] 
	{vaporisation} (l);
	%\path[->] (l) edge node[above,sloped] {solidification} (s);
	\draw[<-] (l) .. controls +(-45:1cm) and +(160:2cm) .. node[above,sloped] 
	{liquéfaction} (g);
	
	\draw[<->] (g) -- (s) node[pos=0.5,below,sloped] {sublimation};
\end{tikzpicture}

\end{document}