Entropy Change

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Entropy change in reversible process is:

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Entropy ($S$) is a thermodynamic property that measures the degree of disorder in a system. 
- For an internally reversible process, the differential change in entropy is defined as:
$dS = \frac{dQ_{rev}}{T}$
where $dQ_{rev}$ is the heat transfer at absolute temperature $T$. 
- For an adiabatic reversible process (isentropic), $\Delta S = 0$.

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Entropy Change

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