amount fraction \(x\), \(y\)

Synonym: mole fraction
https://doi.org/10.1351/goldbook.A00296
Amount of a constituent divided by the total amount of all constituents in the mixture. It is also called mole fraction. Amount fraction is equal to the number fraction: the number of entities of one constituent divided by the total number of entities in the mixture.
See also: fraction
Source:
Green Book,2nd ed., p. 41 (https://www.cintegrado.com.br/site/documentos/green_book_2ed.pdf)