Ultrasonic velocities and intermolecular free lengths in binary liquid mixtures of C C 4 with toluene, aniline, o-cresol, m-cresol and pcresol have been calculated theoretically, at different compositions and at temperature 298 K, based on Free Length Theory as revised recently by Kalidoss. It is observed that there is a close agreement of calculated velocities with experimental ones. The shape and thermostatic state picture built up in this formulation could be considered as a good representation of molecular state.
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