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Normalised measure of the molecules/atoms count 

LaTeX Math Inline
bodyN
 in a given volume of sample of substance:

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

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It relates to the substance volumethe mass 

LaTeX Math Inline
body
V
m
 and  of a substance molar volume 
LaTeX Math Inline
bodyV_m
 and molar mass of a given substance as:

LaTeX Math Block
alignmentleft
\nu = \frac{Vm}{V_mM}


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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}

where

LaTeX Math Inline
bodym

mass of a substance with amount

LaTeX Math Inline
body\nu

LaTeX Math Inline
bodym_u

molecular mass of a given substance

LaTeX Math Inline
bodyM

molar mass of a given substance




It also 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}


Expand
titleDerivation


LaTeX Math Block
alignmentleft
\nu = \frac{m}{M} = \frac{\rho \cdot V}{M}  = \frac{V}{V_m}

where

molecular mass of a given substance

LaTeX Math Inline
bodym

mass of a substance with amount

LaTeX Math Inline
body\nu

LaTeX Math Inline
bodym_u

LaTeX Math Inline
bodyM

molar mass of a given substance

LaTeX Math Inline
body\rho

density of a given substance


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