What is special about the Avogadro's Constant ?? 6.0221367x10^23 is the avogrado's constant. Does this amount of substances just mean that 6.0221367x10^23 molecules or atoms in gaseous state arrangement will occupy a constant volume provided they are under the same condition(same temperature and pressure) ?? Is it true that the avogadro's constant also imply that with this amount of atoms of same element, they could contribute a mass(g) of exactly a whole number ??