According to entropy principle, the entropy of an isolated system can never decrease and remains constant only when the process is reversible.

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The second law of thermodynamics states that the total entropy of an isolated system can never decrease over time, and is constant if and only if all processes are reversible. If a process is irreversible, the total entropy of the system and its surroundings increases.

According to Entropy Principle, the Entropy of an Isolated System