Number Density Calculator
Find the number of atoms per cubic metre.
Number density is how many particles occupy a cubic metre.
The math behind it
n = ρ·N_A ÷ M, with molar mass M in kg/mol and Avogadro's number N_A.
Worked example
Aluminium (2700 kg/m³, 27 g/mol) → about 6.0 × 10²⁸ atoms/m³.
FAQ
Where is it used?
Solid-state physics, plasma physics and the mean free path calculation.