School of Studies in Chemistry, Vikram University, Ujjaixi, (M.P.) Manuscript received 7 April 1972; revised 20 March 1973; accepted 21 June 1973 The results from an extensive work carried out for the experimental verification of the equa­tion V\(m\)r\(m\)\({1 {} \over 4}\) = K1x+K2 put forth earlier have been presented. In this equation Vm is mean molecular volume of the solution, r\(m\) is surface tension of the solution, x is molar fraction of the solute and K1 and K2 are constants. The equation is found to be fairly and widely appli­cable in the case of following types of binary systems; (i) Electrolytes in water, (ii) Electrolytes in non-aqueous solvents at low and high concentration ranges, (iii) organic solids in organic sol­vents at low and high concentration ranges, (iv) organic liquids in organic solvents having large and small, mutual surface tension differences at all concentration ranges.