Abstract
Combining a theory presented here with available data on thermodynamic properties of liquids, correlation coefficients of the fluctuations in enthalpy and volume, as well as those in intermolecular potential energy and volume are evaluated for 16 organic liquids and water. Fluctuations in intermolecular potential energy and volume of nonpolar liquids have a large correlation coefficient of about 0.8 or more at 25°C. Any attractive polar interaction between constituent molecules has the effect of reducing the correlation coefficients. Correlation coefficients for water are exceptionally small near room temperature, increase monotonously with temperature, and reach the room temperature value for polar organic liquids only at about 150°C.
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