Knudsen Number Calculator
Compute the Knudsen number Kn = λ/L (mean free path / scale).
Input Data
Mean Free Path
m
Char Length
m
Results
Kn = λ/L.
0.068
At a glance:Kn = λ/L; Kn≪1 continuum, Kn≫1 free-molecular. Complements mean-free-path and reynolds-number.
Formula
Kn = λ / L.
$$\mathrm{Kn} = \dfrac{\lambda}{L}$$How to Use
- Enter mean free path and scale.
- The tool returns Kn.
Case Studies
λ=1e-7, L=1e-3
Kn = 1e-4 (continuum).
FAQ
Regimes?
Kn<0.01 continuum; 0.01–0.1 slip; >10 free molecular.
Related Tools
References
Content review: Calculatorism Editorial Team. Results are for reference only; please refer to the relevant authorities for the official figures.