Molar excess volumes, V-ijk(E), of 1,3-dioxolane or 1,4-dioxane ( i) + water ( j) + propan-1- ol or + propan-2-ol (k) ternary mixtures have been determined dilatometrically over the entire composition range at 308.15 K. The resulting data have been analyzed in terms of ( 1) the graph theoretical approach ( which involves the topology of the mixture constituents), ( 2) the Sanchez and Locombe theory and ( 3) the Flory theory. It was observed that V-ijk(E) values predicted by the graph theory compare reasonably well with their corresponding experimental values. However, although V-ijk(E) values calculated by the Sanchez and Lacombe and Flory theories are of same sign and magnitude, the qualitative agreement is poor.
