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Diffusion and Mean Free Path - constantly changing The...

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Diffusion and Mean Free Path Similarly to effusion, diffusion is faster for light molecules than for heavy ones The relative rates of diffusion of two molecules is given by the equation The speed of molecules is quite high, however... the rates of diffusion are slower than molecular speeds due to molecular collisions Due to the density of molecules comprising the atmosphere, collisions occur about 10 10 (i.e. 10 billion ) times per second Due to these collisions, the direction of a molecule of gas in the atmosphere is
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Unformatted text preview: constantly changing The average distance traveled by a molecule between collisions is the mean free path • The higher the density of gas, the smaller the mean free path (more likelyhood of a collision) • At sea level the mean free path is about 60 nm • At 100 km altitude the atmosphere is less dense, and the mean free path is about 0.1 m (about 1 million times longer than at sea level)...
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