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The number of specified molecules per unit volume:

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

where

$\begin{array}{l}V\end{array}$	volume
$\begin{array}{l}N\end{array}$	number of molecules

SI Unit	Oil Metric Unit	Oil Field Unit
m^-3	m^-3	m^-3

This property is directly related to the average intermolecular distance, which is in case of isotropic matter: $\begin{array}{l}d = n^{-1/3}\end{array}$ .

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Molecular Concentration = n

See also