Definition:Avogadro's Number

Definition
Avogadro's number is defined as the number of particles in a mole.

Its value is defined as:
 * $6 \cdotp 02214 076 \times 10^{23}$

and is usually denoted either $N_A$ or $L$.

Thus it is the constant of proportion for converting the mass of one mole of a substance to the (arithmetic) mean mass of one molecule of that substance.