amount fraction x (y for gaseous mixtures)

Synonym: mole fraction
Amount of a @C01281@ divided by the total amount of all constituents in the mixture. It is also called mole fraction. Amount fraction is equal to the @N04265@: the @N04266@ of one @C01281@ divided by the total number of @M03986@ in the mixture.
See also:
Green Book, 2nd ed., p. 41 [Terms] [Book]