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In [[chemistry]], the '''volume fraction''' φ<sub>''i''</sub> is defined as the volume of a constituent ''V''<sub>''i''</sub> divided by the volume of all constituents of the mixture ''V'' prior to mixing:<ref>{{GoldBookRef | file = V06643 | title = volume fraction}}</ref> | |||
:<math>\phi_i = \frac {V_i}{V}</math> | |||
Being dimensionless, its unit is 1; it is expressed as a number, e.g., 0.18 or 18%. | |||
Volume fraction is also called '''volume concentration''' in [[ideal solution]]s where the volumes of the constituents are additive (the volume of the solution is equal to the sum of the volumes of its ingredients). | |||
The sum of all volume fractions of a mixture is equal to 1: | |||
:<math>\sum_{i=1}^{N} V_i = V ; \qquad \sum_{i=1}^{N} \phi_i = 1</math> | |||
==See also== | |||
* For non-ideal mixtures, see [[Partial molar volume]]. | |||
* For [[alcoholic beverage]]s, see [[alcohol by volume]] and [[Volume percent]]. | |||
== References == | |||
{{reflist}} | |||
{{Chemical solutions}} | |||
[[Category:Dimensionless numbers of chemistry]] | |||
[[Category:Physical chemistry]] | |||
[[Category:Thermodynamics]] | |||
Revision as of 03:01, 15 March 2013
In chemistry, the volume fraction φi is defined as the volume of a constituent Vi divided by the volume of all constituents of the mixture V prior to mixing:[1]
Being dimensionless, its unit is 1; it is expressed as a number, e.g., 0.18 or 18%.
Volume fraction is also called volume concentration in ideal solutions where the volumes of the constituents are additive (the volume of the solution is equal to the sum of the volumes of its ingredients).
The sum of all volume fractions of a mixture is equal to 1:
See also
- For non-ideal mixtures, see Partial molar volume.
- For alcoholic beverages, see alcohol by volume and Volume percent.
References
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