Since both fields use both functions, a compromise has been suggested, using " A " to denote the Helmholtz function and " G " for the Gibbs function.
2.
In physics, the letter " F " can also be used to denote the Helmholtz energy, as Helmholtz energy is sometimes referred to as the " Helmholtz function, " " Helmholtz free energy, " or simply " free energy " ( not to be confused with Gibbs free energy or free enthalpy ).
3.
Since it makes no reference to any quantities involved in work ( such as " p " and " V " ), the Helmholtz function is completely general : its decrease is the maximum amount of work which can be done " by " a system, and it can increase at most by the amount of work done " on " a system.
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