Mean Free Path Calculator

Mean Free Path Calculator

Calculate the average distance a particle travels between collisions in a gas.

Last updated: March 2026 | By ForgeCalc Engineering

Example: Nitrogen ≈ 0.37e-9 m

Mean Free Path (λ)
6.5673e-8
Meters (m)

The Formula

λ = (k_B * T) / (√2 * π * d² * P)

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