Macleod-Sugden correlation

Stability of phase boundaries depends on the surface tension. Surface tension in a supercritical fluid system is of major importance for drying, surfactant eflicacy, and extraction. The surface tension of a gas increases with pressure and approaches zero at the critical point while the surface tension of liquid decreases with pressure resulting in dissolution of supercritical components in the liquid phase. The mefliods useful in correlating surface tension include Macleod-Sugden correlation and corresponding states theory. ... 

The parachor method is one of the most commonly used correlations for the surface tensions. The method was originally suggested by MacLeod [50] and Sugden [51] for a singlecomponent fluid and was extended to multicomponent systems by Weinaug and Katz [52]. An expression for the surface tension in this method is... 

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