ˈgibzˈhel]mˌhōlts-, -ˈheu̇] noun
Usage: usually capitalized G&H
Etymology: after Josiah Willard Gibbs died 1903 American mathematician and physicist and Hermann L. F. von Helmholtz died 1894 German scientist
: an equation in thermodynamics that is applicable to reversible isobaric chemical processes: the difference between the change in free energy and the heat of reaction equals the product of the absolute temperature and the rate of change of free energy with temperature