What is parachore and its effect in chemistry?
Parachor is a quantity relating the surface tension to the
molecular weight and density. It is defined by the formula (surface
tension ^1/4) * M / d. Parachor is used in solving structural
problems.
Sugden defined in 1924 parachor as (surface tension in
mN/m)^(1/4).(molar volume in cm^3/mol). This definition is used up
to now and it results in usual parachor values of the order of
magnitude of 100. Therefore, parachor is a derived quantity like
any other and its unit is (mN/m)^(1/4).cm^3/mol. This unit is so
bizare in the light of usual experience that most authors do not
dare give it in their texts and prefer not to give any unit. Owing
to this fact, there has arisen the mistaken impression that the
parachor has no unit.
S. Sugden, J. Chem. Soc. Trans. 125 (1924) 1167--1177, from
contemporary literature see
M. Souckova et al. J. Chem. Thermodynamics 83 (2015) 52-60