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Water Vapor Diffusion in Relatively Dry Soil: II. Desorption Experiments¹

ABSTRACT

Water vapor diffusion during desorption was measured in three soil materials at water contents corresponding to a relative pressure range of 0.97 to about 0.05. The data were obtained from a transient desorption experiment conducted at 27°C. Diffusivities, calculated from analysis of water content distribution curves, increase and then decrease with increasing water content. The desorption diffusivity-water content curves exhibit a less distinct maximum, with the maximum occurring at a higher water content than do the sorption diffusivity-water content curves.

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 November 26, 1963. Accepted for publication February 3, 1964.