Parachor definition

A small number of physical properties appears to provide more definite information these are molecular refraction, parachor, and (in a more limited way) ultraviolet absorption6. 

The following definitions are used for the liquid and vapor mixture parachors ... 

There exist in the literature claims concerning the occurrence of branching in particular compounds the more definite of these have been refuted in recent years. Backer and co-workers (10, 11) formulated some cyclic di- and trisulfides with branched sulfur groupings from a comparison of their ultraviolet and infrared spectra with those of other di- and polysulfides, Schotte (202) concluded that branching does not occur. Baroni (15), on the basis of parachor measurements, assigned isomeric branched... 

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