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<a accesskey="3" href="page.php?w=activity_coefficient&amp;p=2">3.Next</a>
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<p>In <a href="page.php?w=thermodynamics">thermodynamics</a>, an <b>activity coefficient</b> is a factor used to account for deviation of a <a href="page.php?w=mixture">mixture</a> of <a href="page.php?w=chemical_substance">chemical substance</a>s from ideal behaviour. In an <a href="page.php?w=ideal_mixture">ideal mixture</a>, the microscopic interactions between each pair of <a href="page.php?w=chemical_species">chemical species</a> are the same (or macroscopically equivalent, the <a href="page.php?w=enthalpy_change_of_solution">enthalpy change of solution</a></p><p>
<a accesskey="3" href="page.php?w=activity_coefficient&amp;p=2">3.Next</a>
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