  The aim of this work is to study the problem of the existence of a
fundamental relation between the interfacial tension of a system of two
partially miscible liquids and the surface tensions of the pure substances. It
is shown that these properties cannot be correlated from the physical point of
view. However, an accurate relation between them may be developed using a
mathematical artifact. In the light of this work, the basis of the empirical
formula of Girifalco and Good is examined. The weakness of this formula as well
as the approximation leading to it are exposed and discussed and, a new
equation connecting interfacial and surface tensions is proposed.
