Number density
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Number density in physics is a subtle generalization of the concept of density and refers to the number of objects (particles, sound waves, galaxies, etc.) per volume.
Number density can be written as
- <math>n = \frac{N}{V} </math>
where
- n is the number density,
- N is the total number of entities
- V is the volume.
Conversely, the total number of entities can be written as
- <math>\iiint_V n\;dV = N </math>
where
- <math>dV</math> is a volume element.
The number density of solutes in a solvent is called concentration.fr:Nombre volumique de molécules
