The densities, ρ and viscosities, η of binary mixtures of C2H4Cl2+ C3H7NO, C2H4Cl2+C2H6OS, CH2Cl2+C3H7NO and CH2Cl2+ C2H6OS have been measured over the entire composition range at 308.15 K. From this experimental data, deviation in viscosity, Δη, excess free volume, E f V , excess internal pressure, E i p , excess enthalpy, H*E and excess Gibbs free energy, ΔG*E have been measured. From the positive and negative values of excess properties strong interactions such as hydrogen bond formation between the dissimilar molecules, dipole-dipole interactions exist between the unlike molecules. The experimental viscosity data of all of these binary liquid mixtures have been correlated with viscosity models.
