state nature second law?
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The second law states that there exists a useful state variable called entropy S. The change in entropy delta S is equal to the heat transfer delta Q divided by the temperature T. An example of a reversible process is ideally forcing a flow through a constricted pipe. Ideal means no boundary layer losses.
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The Clausius form of the second law states that spontaneous change for an irreversible process in an isolated system (that is, one that does not exchange heat or work with its surroundings) always proceeds in the direction of increasing entropy.
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