Concentration of a substance in a mixture measured as moles of the substance per mole of mixture. For example, the mole fraction of oxygen in air is about 0.21, which means that 1 mol of air contains about 0.21 mol O 2 .
MOLE FRACTION
Meaning of MOLE FRACTION in English
General chemistry English glossary. Английский глоссарий общей химии. 2012