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In [[chemistry]] and [[physics]], the [[dimensionless]] '''mixing ratio''' is defined as 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.<ref>{{GoldBookRef | file = M03948 | title = mixing ratio}}</ref> | |||
== Mole ratio == | |||
In [[atmospheric chemistry]], mixing ratio usually refers to the '''mole ratio''' <math>r_i</math>, which is defined as the [[amount of substance|amount]] of a constituent <math>n_i</math> divided by the total amount of all ''other'' constituents in a mixture: | |||
:<math>r_i = \frac{n_i}{n_{tot}-n_i}</math> | |||
The mole ratio is also called '''amount ratio'''.<ref>http://www.iupac.org/publications/pac/80/2/0233/</ref> | |||
If <math>n_i</math> is much smaller than <math>n_{tot}</math> (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''' <math>\zeta_i</math>, which is defined as the mass of a constituent <math>m_i</math> divided by the total mass of all ''other'' constituents in a mixture: | |||
:<math>\zeta_i = \frac{m_i}{m_{tot}-m_i}</math> | |||
The mass ratio of water vapor in air can be used to describe [[Humidity#Mixing ratio or humidity ratio|humidity]]. | |||
==References== | |||
{{Reflist}} | |||
<!--Categories--> | |||
[[Category:Chemical properties]] | |||
[[Category:Dimensionless numbers of chemistry]] | |||
Revision as of 21:18, 27 January 2014
In chemistry and physics, the dimensionless mixing ratio is defined as 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 , which is defined as the amount of a constituent divided by the total amount of all other constituents in a mixture:
The mole ratio is also called amount ratio.[2]
If is much smaller than (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 , which is defined as the mass of a constituent divided by the total mass of all other constituents in a mixture:
The mass ratio of water vapor in air can be used to describe humidity.
References
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