Use Eqs. (4.30), (4.42), and (4.48) to show that (∂CP/∂P)T = –T(∂2V/∂T2)P. The volumes of substances increase approximately linearly with T, so ∂2V/∂T2 is usually quite small. Consequently, the pressure dependence of CP can usually be neglected unless one is dealing with high pressures.
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