The mean free path predicted for hydrogen at 20C and 3 atm would be3.49x10^-8m.This distance is 80 times the effective molecular diameter of hydrogen (4.38x10^-10 m.) While much less than the 5 orders of magnitude difference between nuclear and atomic radii,it would seem that 2orders of magnitude difference in size might still limit the ability to accurately indicate scale in these pictures.However,the mean free path is not an accurate measure of the average distance between particles(25).Consideration of the average particle separation in a gaseous sample is frequently neglected in physical chemistry texts,but might be important if one were to accurately represent a gas using these particulate figures. A simple estimate of this average particle separation can be made based on the volume of the container and the number of particles in the sample(26): the mean particle separation is equal to the cube root of V/N,where V is the volume of the container(assumed cubic for simplicity)and N is the total number of particles in the container.