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The Temperature Dependence of Soil Water Vapor Pressure¹

ABSTRACT

The temperature dependence of soil water vapor presure was studied with a psychrometric vapor pressure technique in the range of 0.96 to 1.00 relative vapor pressures and below 0.96 with gravimetric and calorimetric heat of immersion techniques. For Millville silt loam at constant water content, the relative vapor pressure decreased with increasing temperature. Both differential and integral entropy values were calculated. The difference between the partial molar entropy of pure free water vapor and the partial molar entropy of adsorbed water led to the conclusion that soil water molecules are arranged, on the average, less randomly than water vapor molecules. At the same time, comparison with the entropy of vaporization of pure water suggested a more random arrangement of molecules in soil water than in free liquid water.

¹ The research reported herein was done in cooperation with 12 western states and the U. S. Department of Agriculture, ARS, as a part of Regional Research Project W-68. Published with the approval of the Utah Agr. Exp. Station, Logan, as Journal Paper No. 387.

² Research Associate and Professor of Soil Physics, respectively, Utah State University, Logan.

Received for publication February 17, 1964. Accepted for publication May 27, 1964.