Minimum total potential energy principle

In chemistry, the volume fraction φ_i is defined as the volume of a constituent V_i divided by the volume of all constituents of the mixture V prior to mixing:

$\phi _{i}={\frac {V_{i}}{V}}$

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:

$\sum _{i=1}^{N}V_{i}=V;\qquad \sum _{i=1}^{N}\phi _{i}=1$

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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