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Normalised measure of the molecules/atoms number  count 

LaTeX Math Inline
bodyN
 in a given volume of substance:

LaTeX Math Block
anchor1
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\nu = \frac{N}{N_A}

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It relates to the substance volume 

LaTeX Math Inline
bodyV
 and substance molar volume 
LaTeX Math Inline
bodyV_m
 as:

LaTeX Math Block
alignmentleft
\nu = \frac{V}{V_m}


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titleDerivation


LaTeX Math Block
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\nu = \frac{N}{N_A} = \frac{ m_u \cdot N }{m_u \cdot N_A} = \frac{m}{M} = \frac{\rho \cdot V}{M}  = \frac{V}{V_m}




See also

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Natural Science / Physics