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Gibbs energy and Helmholtz energy are commonly called 'free energy.' Tell me what "free" means here.

Gibbs energy and Helmholtz energy are commonly called 'free energy.' Tell me what "free" means here.
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Free energy refers to the energy in a system that is free to do work i.e. the internal energy minus any energy that is unavailable to perform work. Internal energy accounts for the total energy of the system. Free energy is used to determine how systems change and how much work they can produce. It is generally called free because that energy is readily available anytime. If needed the reaction can steal this energy without necessarily having to pay for it or work for it.

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