noun The energy available in a particular chemical system to do useful work. In more detail: Helmholtz free energy, A: the internal energy of a system minus the product of its entropy and absolute temperature. Gibbs free energy, G: the enthalpy of a system minus the product of its entropy and absolute temperature.
noun Helmholtz free energy, A: the internal energy of a system minus the product of its entropy and absolute temperature.
noun Gibbs free energy, G: the enthalpy of a system minus the product of its entropy and absolute temperature.
noun Used other than figuratively or idiomatically: see free, energy.