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It's basically just saying that the entire internal energy of a system is not all convertible into useful work. The portion that can be converted into useful work can be referred to as the available energy, and the portion that cannot is the unavailable energy. And I believe entropy is the measure of this unavailable energy
The first law of thermodynamics is basically the conservation of energy. Energy can't be created or destroyed; however, it can change from more useful forms to less useful forms. Every energy transfer has some amount of less useful energy generated (usually in the form of heat). Heat that doesn't do work increases the randomness (disorder) of the universe. Entropy is the degree of randomness (disorder) in a system. Since every energy transfer results in some amount turning into heat (or unusable energy), and heat that is not doing work increases the randomness of the universe, we can say entropy is a measure of unavailable energy.
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