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<p>in defining the entropy of mixtures.</p>

<p>Additionally, the system must be in (quasistatic) equilibrium with the surroundings at all time, and there must be no dissipative effects, such as friction, for a process to be considered reversible.</p>

<p>Reversible processes are useful in thermodynamics because they are so idealized that the equations for <a href="page.php?w=Heat">heat</a> and <a href="page.php?w=Work_%28thermodynamics%29">expansion/compression work</a> are simple. This enables the analysis of <a href="page.php?w=Carnot_cycle">model processes</a>,</p><p>
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