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Ratio

Mass fraction (chemistry)
Fraction of one substance's mass to the mass of the total mixture
Mole fraction
The proportion of a constituent to the total amount of all constituents in a mixture, expressed in mol/mol
Neper
Logarithmic unit for ratios of measurements of physical field and power quantities
Relative density
Ratio of the density (mass per volume) of a substance to the density of a given reference material
Volume fraction
Dimensionless quantity