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Trouton's rule[′trau̇t·ənz ‚rül]
An approximation rule for the derivation of molar heats of vaporization of normal liquids at their boiling points.
The rule that, for a nonassociated liquid, the latent heat of vaporization in calories is equal to approximately 22 times the normal boiling point on the Kelvin scale.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.