Ratio of substance molecules $\begin{array}{l}N\end{array}$ to substance volume $\begin{array}{l}V\end{array}$ :

$\begin{array}{l}\displaystyle n = \frac{N}{V}\end{array}$

It is related to substance density $\begin{array}{l}\rho\end{array}$ as:

$\begin{array}{l}\displaystyle n = \frac{\rho}{M}\end{array}$

where

$\begin{array}{l}M\end{array}$

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See also