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<p>potentials using physically measurable parameters. For example the free energy expressions</p>

<p>and</p>

<p>can be integrated at constant temperature and quantities to obtain:</p>

<p>
:(at constant T, {N<sub>j</sub>} )</p>

<p>
:(at constant T, {N<sub>j</sub>} )</p>

<p>which can be measured by monitoring the measurable variables of pressure, temperature and volume. Changes in the enthalpy and internal energy can be measured by <a href="page.php?w=calorimetry">calorimetry</a> (which measures the amount of heat &Delta;Q released or absorbed</p><p>
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