ISOTHERMAL COMPRESSIBILITY AND SOUND-VELOCITY OF BINARY-LIQUID SYSTEMS - APPLICATION OF HARD-SPHERE MODELS

Sound velocity and density were measured in six binary liquid mixtures namely, n-heptane + toluene (I); n-heptane + n-hexane (II); toluene n-hexane (III); cyclohexane + n-heptane (IV); cyclohexane + n-hexane (V), and n-decane + n-hexane (VI) at 298.15 K. The experimental isothe rmal compressibility has been evaluated from measured values of densit y and sound velocity. The isothermal compressibility of these mixtures has been calculated theoretically using different models for the hard sphere equation of state and also using Flory's statistical theory. T he computed values of isothermal compressibility were also compared wi th the experimentally evaluated values. A satisfactory agreement has b een observed.