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Knudsen number

 

Knudsen number

The Knudsen number (Kn) is a dimensionless number defined as the ratio of the molecular mean free path length to a representative physical length scale.

It is defined as:

where

  • T, temperature (K)
  • kB, Boltzmann's constant
  • P, total pressure (Pa)
  • , diameter (m)

    See also

  • Fluid dynamics
  • Mach number
  • Reynolds number



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