Influence of Geometrical Factor on Volumetric Properties of Binary Mixtures

The molar and additive rule is obtained for a density of model mixtures, whose components do not interact and have geometrically identical structures of pure liquids (equality of molecule volumes and packing densities), included in the mixture. Microreasons are revealed for deviation of the mixture density from the molar and additive rule in case when the pure liquids have structures differing in geometrical pattern. It is stated that the geometrical factor may substantially contribute to the surplus value of volumetric properties of a real mixture. Maximum values of this factor contribution in the relative surplus volume are calculated for various type mixtures.