Question: The space between two large parallel plates separated by a distance l = 5.0 mm is filled with helium under a pressure p = t.0

The space between two large parallel plates separated by a distance l = 5.0 mm is filled with helium under a pressure p = t.0 Pa. One plate is kept at a temperature tl = 17 °C and the other, at a temperature t2 = 37 °C. Find the mean free path of helium atoms and the heat flow density.

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