free energy
Noun

free energy (uncountable)

  1. (physics, chemistry) The energy that is available in a particular chemical system to do useful work. In more detail:
    1. The Helmholtz free energy, A (the internal energy of a system minus the product of its entropy and absolute temperature)
    2. The Gibbs free energy, G (the enthalpy of a system minus the product of its entropy and absolute temperature)
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