ANTONOW RULE 85 YEARS LATER

This paper deals with a strategy for evaluation of interfacial tension s between the equilibrated phases in a multicomponent fluid mixture. A ccording to this strategy, known in the literature as Antonow's rule, the interfacial tension is equal to the difference of surface tensions of the fluid phases under consideration measured against their common vapour. The paper gives an account of the debate concerning Antonow's rule during the last 85 years and describes its present status as a t ool for the determination of interfacial tensions in critical, tricrit ical, and related multicomponent fluid mixtures including the case whe re one of the phases is a solid.