Viscosities at 25°C have been measured at different molar concentrations for fourteen binary liquid systems representing different types and degrees of interaction between unlike components. Excess viscosities tend to become less negative and then increasingly positive as the strength of the interaction between unlike molecules increases and the excess viscosity is approximately proportional to the strength of the interaction. Some expressions describing viscosities of binary liquid mixtures in terms of those of the components and a parameter attributed to interaction between them are examined. The parameter din the expression In 77 = XI In 71fx2 In 7 2 f x m d appsars to be a useful measure of the strength of the interaction.

Ultrasonic velocities and densities at 25°C have been determined at different molar concentrations for fourteen binary liquid systems representing different types and degrees of interaction between the components. Adiabatic compressibilities are calculated. Excess adiabatic compressibilities tend to become less positive and then increasingly negative as the strength of the interaction between the unlike molecules increases. Excess adiabatic compressibility is approximately proportional to the strength of the interaction. Excess volumes show a similar variation. The variations of excess adiabatic compressibility with composition are generally similar to those shown by other excess properties of binary liquid mixtures.

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