In thermodynamics, the Helmholtz free energy is a thermodynamic potential which measures the useful work obtainable from a closed thermodynamic system at a constant temperature and volume. For such a system, the negative of the difference in the Helmholtz energy is equal to the maximum amount of work extractable from a thermodynamic process in which temperature and volume are held constant. Under these conditions, it is minimized at equilibrium. The Helmholtz free energy was developed by Hermann von Helmholtz and is usually denoted by the letter A, or the letter F . The IUPAC recommends the letter A as well as the use of name Helmholtz energy. In physics, the letter F is usually used to denote the Helmholtz energy, which is often referred to as the Helmholtz function or simply free energy .
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