Helmholtz free energy is a thermodynamic potential that measures the work obtainable from a closed system at constant temperature and volume. It is defined as the difference between the internal energy of the system and the product of its temperature and entropy, expressed mathematically as $$A = U - TS$$. This concept is crucial for understanding how systems exchange energy and work in various thermodynamic processes, particularly in relation to other potentials like Gibbs free energy.
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