Write Brief Answer · Q5
Q.What is the usual definition of entropy? What is the unit of entropy?
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Concept understanding — Second Law of Thermodynamics and Entropy
The first law only guarantees energy conservation -- it says nothing about DIRECTION, so it cannot explain why hot water cools spontaneously but cold water never spontaneously heats itself. The second law fills that gap by introducing entropy , a state function measuring molecular disorder, defined via $dS=dq_ …
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