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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>
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| == Mole ratio ==
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| 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: | |
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| :<math>r_i = \frac{n_i}{n_{tot}-n_i}</math>
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| The mole ratio is also called '''amount ratio'''.<ref>http://www.iupac.org/publications/pac/80/2/0233/</ref>
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| 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]].
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| == Mass ratio ==
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| 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:
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| :<math>\zeta_i = \frac{m_i}{m_{tot}-m_i}</math>
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| The mass ratio of water vapor in air can be used to describe [[Humidity#Mixing ratio or humidity ratio|humidity]].
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| ==References==
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| {{Reflist}}
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| <!--Categories-->
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| [[Category:Chemical properties]]
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| [[Category:Dimensionless numbers of chemistry]]
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Latest revision as of 16:34, 3 January 2015
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