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The change in __________ is the amount of energy in a system that is available to do work.

User Joecritch
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The answer is free energy.
In fact, in thermodynamics, the free energy of a system is defined as the energy that can be converted to do work. Helmholtz definition of free energy, for instance, is:

A=U-TS
where U is the internal energy, T the temperature and S is the entropy
User Sam Watkins
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