free energy(n = noun.phenomenon) energy - (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs; "energy can take a wide variety of forms"
is a kind of physical phenomenon
has particulars: activation energy, energy of activation, alternative energy, atomic energy, nuclear energy, binding energy, separation energy, chemical energy, electrical energy, electricity, energy level, energy state, rest energy, work, heat, heat energy, mechanical energy, radiant energy, radiation

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