Gas Diffusion In Soil Article Index for
Gas
Website Links For
Gas
 

Information About

Gas Diffusion In Soil




Composition of Air in soil and Atmosphere :
  • Nitrogen : Soil Air: 79.2% Atmosphere: 79.0%

  • Oxygen : Soil Air: 20.6% Atmosphere: 20.9%

  • Carbon Dioxide : Soil Air: 0.25% Atmosphere: 0.03%


Source: E.J. Russell and A. Appleyard. 1915. The atmosphere of the soil, its composition and causes of variation. Journal of Agricultural Science 7, 1-48.

Gas molecules in soil are in continuous thermal motion according to the Kinetic Theory Of Gases , there is also collision between molecules - a Random Walk .
In soil, a concentration gradient causes net movement of molecules from high concentration to low concentration, this gives the movement of gas by Diffusion .
Numerically it is explained by Fick's Law Of Diffusion .