Volume occupied by one mole of a substance (chemical element or chemical compound) at a given pressure $\begin{array}{l}p\end{array}$ and temperature $\begin{array}{l}T\end{array}$ :

(1)	$\begin{array}{l}\displaystyle V_m = \frac{M}{\rho}\end{array}$

where

$\begin{array}{l}M\end{array}$	molar mass of a substance
$\begin{array}{l}\rho\end{array}$	density of a substance

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See also