At constant pressure, the mean free path 1l2 of a gas molecule
is directly proportional to temperature. At constant
temperature, l is inversely proportional to pressure. If you
compare two different gas molecules at the same temperature
and pressure, l is inversely proportional to the square
of the diameter of the gas molecules. Put these facts together
to create a formula for the mean free path of a gas
molecule with a proportionality constant (call it Rmfp, like
the ideal-gas constant) and define units for Rmfp.
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