dimension-one composition fraction · SI / chemistry · Modern standardized

amount fraction

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Definition

Amount fraction, often called mole fraction, is the amount of substance of a component divided by total amount of substance.

NIST lists amount-of-substance fraction as a distinct dimension-one composition quantity.

Modern use is context-dependent and varies by region or measurement system.

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dimension-one composition fraction · SI / chemistry / materials · Modern standardized

Mass fraction is component mass divided by total mixture mass.

dimension-one composition fraction · SI / chemistry / gas/liquid mixtures · Modern standardized

Volume fraction expresses a component's volume contribution as a fraction of the mixture under a defined convention.