Gas and vapour movements in the soil: I. The diffusion of vapours through porous solids

A - Papers appearing in refereed journals

Penman, H. L. 1940. Gas and vapour movements in the soil: I. The diffusion of vapours through porous solids. The Journal of Agricultural Science. 30 (3), pp. 437-462.

AuthorsPenman, H. L.
Abstract

The dependence of the coefficient of diffusion, D, upon the porosity, S, of a granular solid is investigated experimentally. For steady state conditions, using carbon disulphide and acetone vapours, it is shown that a curve connecting D/D0 and S can be drawn which is independent of the nature of the solid, its moisture content and, within limits, its texture. For a limited range of values of S (0·0 < S < 0·7) a good approximation is D/D0 = 0·66S and over this range the diffusion coefficients are larger than those found by Buckingham for carbon dioxide.Investigation of the non-steady state shows that in soils the attainment of pressure equilibrium is retarded by adsorption, and it is suggested that Buckingham's low values for steady-state conditions can be attributed to premature observations of the diffusion rates; the steady state had probably not been attained when his measurements were made.

Year of Publication1940
JournalThe Journal of Agricultural Science
Journal citation30 (3), pp. 437-462
Digital Object Identifier (DOI)doi:10.1017/S0021859600048164
Open accessPublished as non-open access
ISSN00218596
0021-8596
PublisherCambridge University Press
Cambridge University Press (CUP)

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