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Densities and ultrasonic speeds of the ternary liquid mixture of diethyl amine with acetone and acetophenone in n-hexane at 293K over the entire composition range were measured. From these data, acoustical parameters such as adiabatic compressibility (intermolecular free length (Lf), acoustic impedance (Z), internal pressure (i), excess velocity (U E ), excess adiabatic compressibility ( E ), excess intermolecular free length (Lf E ), excess acoustic impedance ( E ) have been evaluated. These excess parameters have been used to discuss the nature and extent of interaction between the component molecules in the ternary mixtures. The ultrasonic speeds calculated according to Nomoto's relation, Rao's specific sound velocity theory and impedance dependence relation and are compared with those obtained experimentally.

Ultrasonic study of molecular interaction in ternary liquid mixtures at 293K