When calculating the entropy change as a result of transferring heat reversibly to or from a system,the temperature must be constant.

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When calculating the entropy change as a result of transferring heat reversibly to or from a system, the temperature must be constant. This is because entropy is a state function, meaning it only depends on the initial and final state of the system and not the path taken to get there. Therefore, the temperature must be constant during the heat transfer process to ensure that the initial and final states are well-defined and that the change in entropy can be accurately calculated.

When Calculating the Entropy Change as a Result of Transferring