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Originally Posted by serialk11r
Actually that's not true at all. N2 has a shorter bond length due to its triple bond, and therefore has a smaller molecular "size". N2 is also lighter than O2 by 12.5% so if anything, N2 diffuses faster. Air is 78% nitrogen anyways. The only reason to use nitrogen is to slow oxidation, which is why they use them in airplane tires which are at much higher pressure. How much of a benefit reduced oxidation is, I don't know, but pick up a Chemistry textbook and you'll see why it doesn't really make a difference. Same pressure, volume, temperature = same molar mass. At low pressures most gases have approximately the same specific heat capacity, so the temperature fluctuation argument is BS.
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Explain why my tires have stayed at the same PSI without a single leak for 15k then....if it's not the molecule size it must be something.