Energy, entropy and change

Enthalpy is a thermodynamic state function. At constant pressure, under the usual conditions for pressure-volume work, its change is especially useful for discussing heat transferred.

Enthalpy is a thermodynamic state function. At constant pressure, under the usual conditions for pressure-volume work, its change is especially useful for discussing heat transferred.

Entropy is a thermodynamic state function connected to the number and distribution of accessible microscopic states and to energy dispersal.

Entropy is a thermodynamic state function connected to the number and distribution of accessible microscopic states and to energy dispersal.

At constant temperature and pressure, Gibbs energy provides a criterion for the direction of spontaneous change in a closed system under the usual constraints.