Number Density Calculator

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Mass per unit volume of the material.
g/cm³
Atomic or molecular mass from the periodic table.
g/mol
Number density
8.491 x 10^28 m⁻³

Particles per cubic metre (m⁻³)

Number density (cm⁻³)8.491 x 10^22 cm⁻³
Exponent (power of 10)28
28 log10(m⁻³)
High vacuum / space<18Low-pressure gas18-22Atmospheric gas22-26Light metals / semiconductors26-28Dense metals / conductors28+

Number density: 8.491 x 10^28 m⁻³

  • This equals 8.491 x 10^28 atoms per cubic metre, comparable to most engineering metals.
  • Higher number density means more atoms per volume, which typically corresponds to a higher density, better electrical conductivity, and more thermal mass.
  • The value is above 6 x 10^28 m⁻³, in the range of dense metals like platinum and tungsten.

Next stepUse number density together with a microscopic cross-section to compute the macroscopic cross-section for neutron or photon attenuation.

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