LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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Equation (3.5-3) is quite reliable up to temperatures of
about 15 K. Above this temperature data are usually
available. Since the difference between C P and C V is
numerically small for solids, Eq. (3.5-3) is usually
used for C P as well as for C V .
If a phase transition occurs between zero temperature
and the temperature of interest, Eq. (3.5-2) must be
modified to include the entropy change of the phase
transition. If the substance is a liquid at temperature
T 1 , the analogue of Eq. (3.5-2) is
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