Knudsen number (For a Boltzmann gas)
Description
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. This length scale could be, for example, the radius of the body in a fluid. For a Boltzmann gas Knudsen number is depended on the thermodynamic temperature, the particle hard shell diameter and the total pressure.
Related formulasVariables
| Kn | Knudsen number (dimensionless) |
| kB | Boltzmann constant |
| T | The thermodynamic temperature (K) |
| π | pi |
| d | The particle hard shell diameter (m) |
| P | The total pressure, (Pa) |
| L | The representative physical length scale (m) |