What is Avagadros number?

Avagadro’s number refers to the number of units in one mole of any substance, which is defined as its molecular weight in grams; it is a key component in studying chemistry. It equals to 6.022140857 x 1023 .

The units may be electrons, ions, molecules or atoms depending on the character of the reaction. The Avagadro’s number is closely related to the Avogadro’s constant, but defined differently.

The Avagadro number was initially defined by Jean Baptiste Perrin as the number of atoms in one gram molecule of atomic hydrogen, meaning one gram of hydrogen.