the term 'free energy' has been used for either quantity. In physics, free energy most often refers to the Helmholtz free energy, denoted by (or ), while in chemistry, free energy most often refers to the Gibbs free energy. The values of the two free energies are usually quite similar and the intended free energy function is often implicit in manuscripts and presentations.

Meaning of "free"

The basic definition of "energy" is a measure of a body's (in thermodynamics,

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