World Library  
Flag as Inappropriate
Email this Article

Gas diffusion in soil

Article Id: WHEBN0003523151
Reproduction Date:

Title: Gas diffusion in soil  
Author: World Heritage Encyclopedia
Language: English
Subject: Respiration, Hydric soil, Aerostatics, Plant, Carabane
Publisher: World Heritage Encyclopedia

Gas diffusion in soil

Soil gas is the air space in soil containing oxygen, and the oxygen allows for respiration of both plant roots and soil organisms. This air space could also contain carbon dioxide as a product of respiration of plant roots and soil organisms.

Composition of air in soil and atmosphere:[1]

  • 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%

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.

Soil gas includes air, water vapour and the pollutants that might be picked up from the soil underneath a building and carried by air leakage into the building. The chief concerns among these pollutants are radon and methane gases. Template:Or


This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.