Helmholtz free energy
For Hermann von Helmholtz, German physicist.
- (physics, thermodynamics) A measure of the useful work obtainable from a constant temperature, constant volume thermodynamic system; more precisely, the difference between internal energy (of a system) and the product of its absolute temperature and entropy.
- where A is Helmholtz free energy, U is internal energy, T is temperature, and S is entropy.
measure of the useful work from a constant temperature system etc.