<P> Amount of substance is a standards - defined quantity that measures the size of an ensemble of elementary entities , such as atoms , molecules , electrons , and other particles . It is sometimes referred to as chemical amount . The International System of Units ( SI ) defines the amount of substance to be proportional to the number of elementary entities present . The SI unit for amount of substance is the mole . It has the unit symbol mol . The proportionality constant is the inverse of the Avogadro constant . </P>
<P> Amount of substance is a standards - defined quantity that measures the size of an ensemble of elementary entities , such as atoms , molecules , electrons , and other particles . It is sometimes referred to as chemical amount . The International System of Units ( SI ) defines the amount of substance to be proportional to the number of elementary entities present . The SI unit for amount of substance is the mole . It has the unit symbol mol . The proportionality constant is the inverse of the Avogadro constant . </P>
the si unit for amount of substance is
the si unit for amount of substance is
mole
mole