The ultrasonic velocity, density and viscosity at 308 K have been measured in the binary systems of 1,4-dioxane and ethanol with methanol. From the experimental data, various acoustical parameters such as adiabatic compressibility (βa), intermolecular free length (Lf), free volume (Vf), internal pressure (???i), were calculated. The results are interpreted in terms of molecular interaction between the components of the mixtures
