Fully Incompressible Solids and Liquids
Also for solids the specific heats depend in general on temperature and volume (or any other pair of properties), and must be collected in tables. Quite often it is possible to treat the solids to be fully incompressible (no change of volume, v = const), and to assume constant specific heat. Then, internal energy, enthalpy and entropy are
As always, u0, h0 and s0 are suitable reference values. Due to incompressibility, the specific heats at constant volume and constant pressure agree, as the following line of equations shows:
The same approximations can be used for fully incompressible liquids.
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