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The Patel-Teja equation of state has been improved by modifying the temperature dependence of the attractive term to give simultaneous representation of vapor pressure, liquid density, and liquid heat capacity data for polar and nonpolar compounds. For many high-boiling industrially important compounds, the combination of available heat capacity and vapor pressure data provides a thermodynamically sound method of establishing the temperature dependence of the attractive term in the most practical range of 273-523 K. The performance of the equation of state is greatly improved if the critical pressure is used as the adjustable parameter to correlate the thermodynamic properties under the conditions of interest.

Excess volumes at 298.15 K have been measured by means of a vibrating tube densimeter for the binary mixtures of water with methanol, and n-heptane separately with ethyl acetate, n-butyraldehyde, and Isobutyraldehyde. Partial molar volumes have also been calculated.

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