9: The Second Law - Entropy and Spontaneous Change
- Page ID
- 151717
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- 9.1: The Second Law of Thermodynamics
- In a reversible process in which a closed system accepts an increment of heat, dqrev , from its surroundings, the change in the entropy of the system, dS , is dS=dqrev/T . Entropy is a state function. For any reversible process, dSuniverse=0 , and conversely. For any spontaneous process, dSuniverse>0 , and conversely.