By use of Maxwell relations, $(del\frac{S}{d}$elp${)}_T=?($a$)V($b$)-V($c$)\frac{}{V}($d$)-\frac{}{V}.($ is the $C$ expansion coefficient, $($:$=\frac{(del\frac{V}{d}\text{e}\text{l}\text{T}{)}_p}{V}\}$