Our research is focused on measuring the isothermal compressibility of mixtures of ethylbenzene, ethylcyclohexane, and pentylbenzene. The value of the isothermal compressibility is calculated from experimentally accessible measurements of density, coefficient of thermal expansion, heat capacity, and speed of sound through the liquid. Uncertainties are propagated to give a comparison to the precision of direct measurements of isothermal compressibility. Additionally, isentropic compressibility and molar volume are calculated from density and speed of sound data. Further measurements were taken for refractive index and the viscosity. The appropriate excess and increment values were calculated for the properties measured and fit to Redlich-Kister polynomials. Excess volume and compressibility, both isentropic and isothermal, were found to exhibit positive deviations from the ideal mixing rule across all mixtures and while negative deviations were observed in the refractive index increments.

Isothermal compressibility of liquid binary mixtures

2019 Spring National Meeting

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