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Every time a certain quantity of energy is depleted, it is no longer available and is called "dispersed energy". A rise of entropy, then, means a decrease of available energy. (30:6) In summary: the first law of thermodynamics says that the total quantity of energy and of matter is fixed and it cannot be created or destroyed but only transformed; the second law of thermodynamics says that energy and matter can be transformed only in one direction, from an available state to a non available state or better still from a usable state to a non usable state.
(30:7)
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