Linked from
The 11 pages that link to Mass fraction, each with the reason it gives.
ConcentrationBroader topic: It gives a dimensionless concentration based on mixture mass.
Molar massRelated: Molar masses help convert mole-based composition into mass-based composition.
Material balanceRelated: Component balances often use mass fractions to express mixture composition.
Volume fractionCompared with: It measures composition by mass rather than by volume.
Parts-per notationRelated: Mass-based parts-per values express the relative mass of a constituent.