. _:b19690 . _:b19741 . . . _:b19690 . _:b19741 . . . . . . . . "n" . _:b19689 _:b19690 . . . "stofhoeveelheid"@nl . . . _:b19741 . . . _:b19690 . _:b19689 . . . _:b19689 . "Amount of substance is the number of elementary entities such as atoms, molecules, electrons, particles, etc. present in a phenomenon. It is a base quantity in the International System of Units."@en . . _:b19741 . _:b19689 . "amount of substance"@en .