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Transport Phenomena

Problem 2.223

Find the mean free path and the mean time interval between successive collisions of gaseous nitrogen molecules (a) under standard conditions; (b) at temperature \(t=0^{\circ} \mathrm{C}\) and pressure \(p=1.0 \mathrm{nPa}\) (such a pressure can be reached by means of contemporary vacuum pumps).

Reveal Answer
 (a) λ=0.06μm,τ=0.13 ns (b) λ=6Mm,τ=3.8hours\text { (a) } \lambda=0.06 \mu \mathrm{m}, \quad \tau=0.13 \mathrm{~ns} \text { (b) } \lambda=6 \mathrm{Mm}, \quad \tau=3.8 \text {hours}
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