free energy

maximum amount of energy which can be produced from a chemical or mechanical process

Free energy may refer to:PhysicsThermodynamic free energy, the total amount of energy in a physical system which can be converted to do work, in particular:Helmholtz free energy, the amount of thermodynamic energy in a system which can be converted into work at constant temperature (called work content in chemistry).Gibbs free energy, the amount of thermodynamic energy in a system which can be converted into work at a constant temperature and pressure.A perpetual motion machine, creating a source of energy that would violate the Second law of thermodynamics.
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Free energy n. A thermodynamic quantity that is the difference between a system's internal energy and the product of its absolute temperature and [more]Free energy - Community and Resources

Energy that is actually available to do useful work. A decrease in free energy accompanies any spontaneous process . Free energy does not change for systems that are at equilibrium .

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