The rate of diffusion of a gas through a porous membrane depends on the molar mass and to some degree on the molecular diameter. N2 and O2 are almost the same size and N2 is lighter than O2, so if either gas were to diffuse out of the tyre, nitrogen would do it more quickly. Luckily, tyres are designed not to be porous membranes.
__________________
sn48001 |