# Gibbs function

From AMS Glossary

## Gibbs function

(

*Also called*Gibbs free energy, thermodynamic potential.)A mathematically defined thermodynamic function of state, which is constant during a reversible isobaric–isothermal process. The most important such process in meteorology is the change in phase of water substance. In symbols the Gibbs function where

*g*is*h*is specific enthalpy,*T*is Kelvin temperature, and*s*is specific entropy.*Compare*Helmholtz function.