No idea about the solid if gas diffuse in liquid, Diffusivity of gas at the order of 1e-9 m2/s is reasonable.
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The properties of Gases and liquids, John Prausnitz There are a lot of methods to estimate the diffusion coefficients of different gases, liquids. As far as I know, it is quite sensible for the scope of 0.5-5X10^-9 m^2/s as you said. Solids, no idea either.