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The space between two large parallel pla...

The space between two large parallel plates separated by a distance `l = 5.0 mm` is filled with helium under a pressure `p = 1.0 Pa`. One plate is kept at a temperature `t_1 = 17 ^@C` and the other, at a temperature `t_2 = 37 ^@C`. Find the mean free path of helium atoms and the heat flow density.

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