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The oceans are a vast, complex, mostly dark, optically opaque but acoustically transparent world has been only thinly sampled by today’s limited technology and science. Fundamental thermodynamic relationships reveal that volumetric studies on molecules of interest can yield new information. The present studies were performed in sea water with different weight percentage of distilled water. The measurement of ultrasonic velocity, density and viscosity have been made for the mixture of sea water with distilled water at 305 K for different volume fractions. Ultrasonic velocity decreases as concentration of distilled water increases. From these experimental data thermo-acoustical parameters such as adiabatic compressibility (β_a), free length (L_f), Free volume (V_f), internal pressure (π_i) and enthalpy (H) have been calculated using the standard relations. The various excess parameters such as adiabatic compressibility (〖β_a〗^E), free length (〖L_f〗^E), Free volume (〖V_f〗^E), internal pressure (〖π_i〗^E) and enthalpy (H^E) were calculated. The present study was undertaken to have a deeper understanding of the intermolecular interactions between the sea water and distilled water.
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