For a reversible adiabatic process, the change in entropy is

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• According to entropy principle, the entropy of an isolated system can never decrease and remains constant only when the process is reversible.
• The entropy increase due to internal irreversibility is also called entropy production or entropy generation.
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• In a reversible adiabatic process head added is equal to
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• The rate of entropy increase of the control volume          or          the net rate of entropy transfer to it.
• The rate at which entropy is transferred out must          the rate at which entropy enters the control volume.