Parachor
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Parachor is a scientific quantity defined according to the formula:
- P = γ1/4 * M / d
where γ1/4 is the fourth root of surface tension, M is the molar mass, and d is the density.
Parachor "has been used in solving various structural problems."[1]
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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 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.
