Property relations : the Maxwell relations

Thermodynamic properties such as temperature, pressure, volume and entropy are related with each other.

Their mutual relations are called property relations or Maxwell relations, and the equations showing property relations are derived from the differential form of thermodynamic potentials. Since thermodynamic potentials are point functions, they are path-independent. In mathematical terminology, these functions are exact functions. Therefore, thermodynamic potential functions do not depend on the order of differentiation. Applying this property yields four property relations.