Gibbs free energy

== English == === Etymology === For Josiah Willard Gibbs, American physicist. === Noun === Gibbs free energy (uncountable) (physics, physical chemistry, thermodynamics) The difference between the enthalpy of a system and the product of its entropy and absolute temperature: a measure of the useful work obtainable from a thermodynamic system at constant temperature and pressure. Δ G = Δ H − T Δ S {\displaystyle \Delta G=\Delta H-T\Delta S} and G = H − T S {\displaystyle G=H-TS} where G is Gibbs free energy, H is enthalpy, T is temperature, and S is entropy. ==== Translations ==== === See also === Helmholtz free energy