The thinnest wall of a vulcanized-rubber car tire is the sidewall, which typically ranges from 6 mm to 15 mm thick, and the internal pressure is typically 36 psig at 25C. Use the tables of permeabilities from class to compare the relative loss rates of O2 vs. N2 through a 6-mm vulcanized-rubber wall and a 15-mm-thick wall. Neglect any convective mass-transfer effects. What has the greatest effect, the thickness, diffusivity, or solubility?

Diffusivities and Permeabilities in Solids