Equation representing dependence of density on composition was deduced for dilute binary solid solutions. The constants in an expression of
D/kg m
−3=
D0+Δ
D (
C/mass%) were obtained from Vegard’s law. For an easy calculation from contents of commercial alloys expressed commonly in mass%, previously measured values of density were put in order, as functions of mass%. This expression was expanded to multicomponent systems and it has been clarified that the values of Δ
D determined by measurement on binary alloys are also valid for Al–Zn–Mg and Al–Mg–Si–Cu systems. Using the present Δ
D values, the density of rather widespread multicomponent alloys can be easily estimated, excepting Al–Si binary system which density is increased by solute Si and decreased by precipitation of elemental Si from Al(Si) solid solution. Effect of dislocations introduced by severe cold rolling is rather small. Only about 0.2% or 5 kg m
−3 decrease of density was observed in a 87% cold rolled 6N01 alloy.
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