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:, this gives <br/>
:</p>

<p><big>Perfect gas</big></p>
<p>In a <a href="page.php?w=perfect_gas">perfect gas</a>, there are no <a href="page.php?w=potential_energy">potential energy</a> interactions between the particles, so any change in the internal energy of the gas is directly proportional to the change in the <a href="page.php?w=kinetic_energy">kinetic energy</a> of its constituent species and therefore also to the change in temperature:</p>

<p>
:.</p>

<p>The internal pressure is taken to be at constant temperature, therefore</p>

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