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<p>with <a href="page.php?w=fugacity">fugacity</a>.<br/>
:</p>

<p><big>Standard states</big></p>
<p><big>Gases</big></p>
<p>In most laboratory situations, the difference in behaviour between a real gas and an ideal gas is dependent only on the pressure and the temperature, not on the presence of any other gases. At a given temperature, the "effective" pressure of a gas  is given by its <a href="page.php?w=fugacity">fugacity</a> : this may be higher or lower than its mechanical pressure. By historical convention, fugacities have the dimension of pressure, so the</p><p>
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