Fig. 1 Gas diffusivity in completely dry porous media (sands, soils, glass beads, combinations hereof, glass wool, steel wool). Measured data (Penman, 1940; Taylor, 1949; van Bavel, 1952; Currie, 1960; Papendick and Runkles, 1965; and Reible and Shair, 1982) and predictions by three classical gas diffusivity models, Eq. [2] through [4]

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