LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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Entropy Changes for Adiabatic Processes
Consider a reversible adiabatic process for any kind of
a system. We integrate Eq. (3.2-1) along the curve
representing the process. Since dq rev = 0 for every step
of the process,
A reversible adiabatic process does not change the
entropy of the system. We next show that if a system
undergoes an irreversible adiabatic process its entropy
increases.
∆S irrev > 0 (irreversible adiabatic process) (3.2-21)
Combining Eqs. (3.2-11) and (3.2-21),
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