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The intermolecular free-length is evaluated by making use of thermoacoustical parameters followed by a comparative study. To achieve this objective, thermoacoustical parameters of four ternary and two quaternary liquid mixtures have been computed. These parameters have been utilized to calculate the available volume (V a ), which in turn has been used to compute intermolecular free-length (L f ) for the systems under investigation. The computed values of L f have then been compared with the values estimated from wellestablished thermodynamic and ultrasonic methods. To the best of our knowledge, this investigation is a pioneering attempt in evaluation of intermolecular free-length involving multicomponent liquid mixtures by making use of thermoacoustical parameters.

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When sound waves of high amplitude propagate, several non-linear effects occur. Ultrasonic studies in liquid mixtures provide valuable information about structure and interaction in such systems. The present investigation comprises of theoretical evaluation of the acoustic non-linearity parameter of four binary liquid mixtures using Tong and Dong equation at high pressures and Ì ¿¼¿ ½ K. Thermodynamic method has also been used to calculate the non-linearity parameter after making certain approximations.