\frac{1}{L_2}\frac{\partial L_2}{\partial T}+
\frac{1}{L_3}\frac{\partial L_3}{\partial T}=3\alpha_L\nonumber
\end{eqnarray}
- \item
+ \item \[
+ dF=-pdV-SdT \Rightarrow p=-\left.\frac{\partial}{\partial V}\right|T
+ \]
+ \[
+ dE=TdS-pdV \Rightarrow
+ \]
Find an expression for the pressure as a function of the free energy
$F=E-TS$.
Rewrite this equation to express the pressure entirely in terms of