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Kinetic Theory : Parachor

For a non-associating liquid the influence of temperature on the surface tension σ is given by the relation M σ ¼/(D-d) = const. = P, where D and d are the densities of liquid and vapour and M = mol. wt. In many cases d can be neglected. P is called by Sugden the parachor, and is interpreted as the molecular volume measured at a standard internal pressure. The parachor is very approximately additively composed of a sum of terms for the separate atoms together with constants for the particular forms of linkages. Double bonds, rings, etc., have characteristic values, so that the parachor has been used to determine the constitution of molecules.

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