Question

The mean free path is the average distance travelled by a molecule, atom, particle, etc. between a collision with another particle or molecule. Calculate the mean free path, ?, of air at room temperature, T = 71.2

Answer 1

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One mean free path is the average distance travelled by a molecule, atom, particle, etc. between a collision with another particle or molecule. Calculate the mean free path, lambda, of air at room temperature, T = 69.8 degree F. Air is mostly nitrogen. Assume the colisions are between N2 molecules. The diameter of N2 is d = 1.00 x 10-10 m and the gas is at atmospheric pressure, P = 101325 Pa.

We find the mean free path is 9.01*10^-7 m.