LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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where S(T 1 ) is the absolute entropy of the substance
at temperature T 1 . If there is no
solid-solid phase transition between T = 0 and T = T 1
and if the final and initial states are at the same
pressure, we can write for a solid substance
Heat capacity data are difficult to obtain at very low
temperatures. If no data are available for low
temperatures, an approximate theory of Debye can be
used in lieu of data. According to this theory for
sufficiently low temperature, we can use equation:
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