Abstract
Migration of chemical substances in gas system of soil should be considered to purify soil polluted by harmful chemical substances. Fick's law has been applied to gas system as the only theory of this migration in the country. However Fick's law must be employed for the binary gas system and is not appropriate to multi-component gas system. These are a few models or concept for multi-component gas system, for example Stefan - Maxwell equations and Dusty Gas Model. Then this article has concluded the application of Fick's law, the assumption and derivation of Stefan - Maxwell and Dusty Gas Model.
