L25A
         Property determination under isentropic condition
         Quick review thermodynamic relation

L25B
        Evaluating changes in entropy, internal energy and
        enthalpy
        Clapeyron equation
        Example 11.4 applying the clapeyron equation

L25C
        Considering single phase region

L25D
        Example 11.5 evaluating s, u, and h of a gas
        Other thermodynamic relation