Abstract
As a part of a broader scheme dealing with empirical equations in organic chemistry, the parachor was also revised. Parachor is defined1 in equation (1), where γ is the surface tension, d denotes the density and M the molecular weight: 
This expression is considered to be an additive quantity, that is, can be approximately expressed as a sum of empirical increments Pi corresponding to the single atoms or groups in the molecule. As an additive quantity the parachor has been used in solving various structural problems.
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References
Sugden, S., J. Chem. Soc., 125, 1177 (1924).
Quayle, O. R., Chem. Revs., 53, 439 (1953).
Vogel, A. I., et al., J. Chem. Soc., 570 (1961), and preceding papers.
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EXNER, O. Conception and Significance of the Parachor. Nature 196, 890–891 (1962). https://doi.org/10.1038/196890a0
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DOI: https://doi.org/10.1038/196890a0
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