fix gcmc units change for chemical potential

\documentclass[12pt]{article}

\begin{document}

\begin{eqnarray*}

\mu &=&\mu^{id} + \mu^{ex}

\end{eqnarray*}

\end{document}

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\documentclass[12pt]{article}

\begin{document}

\begin{eqnarray*}

\mu^{id} &=& k T \ln{\rho \Lambda^3} \\

&=& k T \ln{\frac{\phi P \Lambda^3}{k T}} 

\end{eqnarray*}

\end{document}

 No newline at end of file