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The Temperature Effect on the Equilibrium Energy Status of Water Held by Porous Media¹

ABSTRACT

Water held in porous media is under the influence of a number of forces. The energy of the water in these force fields may be described with the aid of the potential theory of classical physics or with the aid of classical thermodynamics. Desorption curves were determined for two sand fractions and a silt fraction at 48° and 44°C. Temperature coefficients of the potential calculated on the basis that surface tension-radius of curvature was the principle water-holding mechanism were compared with the experimental observations. The results indicated that in the fine sand (53–74µ) and silt (13.5–18.0µ) other mechanisms besides surface tension-radius of curvature may be involved in holding the water in the porous medium.

¹ Contribution from the Department of Agronomy, University of Illinois, Urbana, in partial fulfillment of the requirements for the Ph.D. degree by the senior author. Published with the approval of the Director of the Illinois Agr. Exp. Sta. Presented before Div. I, Soil Science Society of America, Dec. 7, 1960, at Chicago, Ill.

² Formerly graduate student, University of Illinois, now Associate Professor of Soils, North Dakota State University, Fargo, and Professor of Soil Physics, University of Illinois, respectively.

Received for publication June 2, 1961. Accepted for publication February 2, 1962.