The thermodynamic variable 'X' in the equation
\(\rm (\partial S/\partial P)_T=\frac{1}{T}\left[X+(\partial H/\partial P)_T\right]\) is
1
V
2
S
3
-V
4
CP
The thermodynamic variable 'X' in the equation
\(\rm (\partial S/\partial P)_T=\frac{1}{T}\left[X+(\partial H/\partial P)_T\right]\) is