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Water Vapor Diffusion in Relatively Dry Soil: I. Theoretical Considerations and Sorption Experiments¹

ABSTRACT

Water transfer was measured in three soil materials at water content ranges corresponding to a relative pressure range of 0.97 to about 0.05. At these water contents vapor flow is probably the predominant transfer mechanism. The data were obtained from a transient sorption experiment and diffusion coefficients were calculated from analyses of water content distribution curves. The evaporation-condensation reaction between the liquid and vapor phases was treated by using simultaneous diffusion-reaction theory. Within the water content ranges used the diffusion coefficients increase and then decrease with increasing water content.

¹ Contribution from the Soil and Water Conservation Research Division, ARS, USDA.

² Research Physicist, U. S. Water Conservation Laboratory, Tempe, Ariz.

Received for publication June 14, 1963. Accepted for publication July 31, 1963.