Chemistry / Unit 7 Chem 1297 short lesson, about 20 seconds
Mean Free Path
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The idea
The mean free path is the average distance a gas molecule travels between successive collisions with other molecules.
In practice
Lowering a gas's pressure spreads its molecules farther apart, lengthening the mean free path between collisions.
Where people slip
Mean free path is an average over huge numbers of collisions — no single molecule travels exactly that distance every time.
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