Trouton's rule
= Trouton's rule
{wiki=Trouton's_rule}
Trouton's rule is a principle in physical chemistry that provides an estimate for the entropy of vaporization of a liquid. It states that the entropy of vaporization (\\( \\Delta S_\{vap\} \\)) of many liquids at their normal boiling points is approximately equal to a constant value, which is about 88 to 100 J/mol·K. This rule holds true for a variety of organic liquids, particularly those that are non-polar or weakly polar.