What does the symbol Cp represent in Bridgman's thermodynamic equations?

The symbol Cp in Bridgman's thermodynamic equations represents heat capacity at constant pressure. Heat capacity is a material property that indicates how much heat energy is required to change the temperature of a substance. When this measurement is made under conditions of constant pressure, Cp specifically describes the amount of heat needed to raise the temperature of a given amount of substance by one degree Celsius (or Kelvin) while maintaining constant pressure.

In thermodynamics, understanding the behavior of materials under different conditions is critical, and the distinction between heat capacity at constant pressure (Cp) and heat capacity at constant volume (Cv) is essential. Under constant volume conditions, no work is performed on or by the system, and this typically results in a different value for heat capacity than when the system can expand or contract under constant pressure.