Tuesday, April 24, 2018

thermodynamics - Why is entropy of system same for reversible and irreversible processes?




I read that entropy change of universe is zero in a reversible process but positive in a irreversible process,then doesn't it mean that entropy change of system of both the processes must be different?


I also read that in a reversible cycle, entropy change is zero for example a carnot cycle,and entropy change in an irreversible cycle is positive for example if we consider friction in a carnot cycle. Doesn't this show that entropy change of system in both processes is different?




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

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