Italian chemist and physicist who advanced the hypothesis that has come to be called Avogadro's law. From this hypothesis other physicists were able to calculate Avogadro's number.
Avogadro's number also Avogadro number n. Symbol N
The number of molecules in a mole of a substance, approximately 6.0225 x 10^23.
This is related to Lochmidt's number which is the number of molecules per unit volume of an ideal gas at 0C and 1 atm pressure. No = 2.68719 x 10^19 cm^-3.