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Calculate the pressures, P, in atmospheres at which the mean free path, l, of a hydrogen molecule will be 1.50 μm, 1.50 mm, and 1.50 m at 20.0 °C. The diameter of a H2 molecule is 270 pm. Which formula would I use?

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http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/menfre.html#c3

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