T

3. Solids and Liquids

For solids and liquids, p & constant (or dv = 0), so du = cv dT

This shows that the internal energy depends upon temperature only ( just as for the ideal gas, but for an entirely different reason).

B. Enthalpy

The enthalpy can be expressed as a function of temperature and pressure:

í@h\ idh\ dh = \@t)/t + \@PP/ t which, from thermodynamic identities, is equivalent to dh = cp dT +

Here

is the specific heat of the material at constant pressure. We again consider some special cases.

1. Ideal Gas

For an ideal gas,

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