When evaluating the thermodynamic properties of a pure subst

Solution

at liquid phase only both are independent to each other

according to Gibbs phase rule for pure substance independent intrinsic properties are 2

for example water 0^o C to 100^o C, T and p are independent to each other

for any substance after boiling point T and P dependent to each other

at liquid phase ,liquid is incompressible ,after getting vapor phase variations are high