The investigation on relative strength and the nature of the intermolecular interaction have been done using Ultrasonic method. In our study Density, viscosity, Ultrasonic sound velocities are estimated, further thermo acoustical parameters and their excess values such as, excess adiabatic compressibility (KsE), excess intermolecular free length (LfE),excess free volume (VfE), excess Gibb’s free energy (GE), excess enthalpy (HE) and excess internal pressure (πE) have been measured for propylene glycol in Hexanol for various mole fractions. These results have been explained on the basis of intermolecular interactions between the components in the liquid mixture and correlations among the parameters are discussed. The study indicated that intermolecular hydrogen bond formation is stronger for (0.8 PG+0.2 Hexanol) molar ratio of the binary mixture liquid complex compare to that of other concentrations and hence this mixture is strongly recommended in therapeutical drugs, pharmaceutical industry and for the high heat transferability applications.

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