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In popular, nontechnical use, entropy is regarded as a measure of the chaos or randomness of a system. In thermodynamics, it is the measure of a system’s energy that is unavailable for work or of the degree of a system’s disorder. Entropy increases during irreversible processes, such as the spontaneous mixing of hot and cold gases. The concept, first proposed in 1850 by the German physicist Rudolf Clausius, is sometimes presented as the second law of thermodynamics, which states what? Discuss
Source: The Free Dictionary