(My answer on Quora).
Gibb’s Free Energy (delta G) measures the maximum amount of reversible work that can be extracted from a system. The caveat though is that the system has to be at constant temperature and pressure (or volume). It must also be a closed system (that is one that does not exchange matter although it can exchange heat and work)
Gibb’s Energy (also known as available energy) is given by the symbol G and is named after the American chemist Josiah Gibbs. The unit of G (like all energies) is Joules (J).
When a system is in chemical equilibrium G is minimized. Delta G becomes zero which implies that no spontaneous energy can be extracted from the system at this pressure and temperature.
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