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Definitions:
Noun
energy
free energy
Definition: (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs; "energy can take a wide variety of forms"
Definition: The energy that is available in a particular chemical system to do useful work. In more detail:
Definition: The Helmholtz free energy, A (the internal energy of a system minus the product of its entropy and absolute temperature)