Definition
According to the Clausius equality, for a closed homogeneous system, in which only reversible processes take place,
That means the line integral is path independent.
So we can define a state function S, called entropy, which satisfies
Read more about this topic: Entropy (classical Thermodynamics)
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—Samuel Taylor Coleridge (1772–1834)
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—Ralph Waldo Emerson (1803–1882)