Definition of Gibbs-helmholtz Equation

A relationship between ΔG, ΔH, and ΔS: ΔG = ΔH - TΔS, where T is temperature, H is enthalpy, S is entropy, and G is free energy.
The Gibbs-Helmholtz equation is a thermodynamic equation useful for calculating changes in the Gibbs energy of a system as a function of temperature. It is named after Josiah Willard Gibbs and Hermann von Helmholtz.