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<p>variables of the system, such as the <a href="page.php?w=energy">total energy</a>, <a href="page.php?w=Thermodynamic_free_energy">free energy</a>, <a href="page.php?w=entropy">entropy</a>, and <a href="page.php?w=pressure">pressure</a>, can be expressed in terms of the partition function or its <a href="page.php?w=derivative">derivative</a>s. The partition function is dimensionless.</p>

<p>Each partition function is constructed to represent a particular <a href="page.php?w=statistical_ensemble">statistical ensemble</a> (which, in turn, corresponds</p><p>
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