LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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where the equality holds for reversible
processes. For any adiabatic process, the
entropy of the system cannot decrease. This is
the most important consequence of the second
law of thermodynamics. Because we define the
universe to include all objects that interact with
each other, the universe can undergo only
adiabatic processes. In any reversible process,
the entropy of the universe remains constant. In
any irreversible process, the entropy of the
universe increases.
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