Mean Free Path (λ = 1/(√2 π d² n) with n number density N/V)
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λ = 1/(√2 π d² n) with n number density N/V
What each symbol means
| Symbol | What it stands for |
|---|---|
| d | Molecular diameter (effective collision diameter) |
| n | Number of molecules per unit volume (m⁻³) |
| λ | Mean free path (m) |
When to use this
Hard-sphere kinetic model; ideal gas number density; stationary target correction gives √2 in denominator (relative motion).