\begin{definition}[Definition:Avogadro's Number]
'''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.
{{NamedforDef|Lorenzo Romano Amedeo Carlo Avogadro|cat = Avogadro}}
\end{definition}