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In other words ds s2 s1 where s is a function of

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Unformatted text preview: ure that REVERSIBLE PROCESSES = (QUASI)EQUILIBRIUM PROCESSES The 2nd Law The 2nd law of thermodynamics states that, for any equilibrium (= reversible) process the quantity dS = δq/T ∫ is an exact differential. In other words, dS = S(2) – S(1) where S is a function of state. It is called entropy. Remember that q is not a function of state. The 2nd law further postulates that for an irreversible process the entropy satisfies the inequality dS > δq/T Therefore for an isolated system that does not exchange heat with its environment the entropy can only increase or remain constant. Examples of using the 2nd law Entropy on an ideal gas. First, let us convince ourselves that entropy is a function of state for an ideal gas. This will also provide...
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