Heat capacity at constant pressure

At fixed pressure, supplied heat equals enthalpy change; for constant

C_{p}

,

Q = C_{p} Δ T

.

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- Difference between constant-pressure and constant-volume heat capacities Heat capacity at constant pressure

Difference between constant-pressure and constant-volume heat capacities ( $C_{P} - C_{V}$ )

For a simple compressible system,

C_{P} - C_{V} = T (\frac{\partial V}{\partial T})_{P} (\frac{\partial P}{\partial T})_{V} .

This follows by expressing the entropy as a function of temperature and volume and using a Maxwell relation.

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