World Library  
Flag as Inappropriate
Email this Article

Mixing ratio

Article Id: WHEBN0002791975
Reproduction Date:

Title: Mixing ratio  
Author: World Heritage Encyclopedia
Language: English
Subject: Defining equation (physical chemistry), PPV, Humidity indicator card, Hygrometer, Microburst
Collection: Chemical Properties, Dimensionless Numbers of Chemistry
Publisher: World Heritage Encyclopedia

Mixing ratio

In chemistry and physics, the dimensionless mixing ratio is the abundance of one component of a mixture relative to that of all other components. The term can refer either to mole ratio or mass ratio.[1]

Mole ratio

In atmospheric chemistry, mixing ratio usually refers to the mole ratio r_i, which is defined as the amount of a constituent n_i divided by the total amount of all other constituents in a mixture:

r_i = \frac{n_i}{n_{tot}-n_i}

The mole ratio is also called amount ratio.[2]

If n_i is much smaller than n_{tot} (which is the case for atmospheric trace constituents), the mole ratio is almost identical to the mole fraction.

Mass ratio

In meteorology, mixing ratio usually refers to the mass ratio \zeta_i, which is defined as the mass of a constituent m_i divided by the total mass of all other constituents in a mixture:

\zeta_i = \frac{m_i}{m_{tot}-m_i}

The mass ratio of water vapor in air can be used to describe humidity.


  1. ^ IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version:  (2006–) "mixing ratio".
  2. ^
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.