Fig. 3 Performance of the WLR(Marshall) model, Eq. [6], when tested against gas diffusivity data for nine differently textured, sieved, and repacked soils. For comparison, the Marshall (1959) model, Eq. [3], for gas diffusivity in dry soil is shown. (a) through (f) data from this study, (g) through (h) data from Xu et al. (1992) at four different soil total porosities, the range of total porosity for each soil is shown and used in Eq. [6], and (i) data from Karimi et al. (1987)

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