Density of number

In Physical, the density of number is the number of objects (particle S, sound waves, Galaxie S, printed pages of Wikinews, etc) contained in a Volume:

n = \ frac {NR} {V}

where

N is the density of number,
NR is the full number of entities considered
V is volume.

Reciprocally, the full number of entities can be written like:

\ iiint_V N \; FD = NR

where

dV is an element of volume.

The density of many aqueous solutions in a solvent is called Concentration.

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