whew!!! Glad some one looked it up about the effective size of the two molecules. Carbon, nitrogen and oxygen are on the second row of the periodic table, with carbon in group IV followed by Nitrogen and finally by Oxygen. So when someone said CO2 is smaller than N2huh?
Now about the permeability, just because something has an effectively larger diameter doesn't make it less permeable. Things that can affect is the Van-der-Waal force (something that poped up first in my head) and I'm sure there are others. but this can create drag on a molecule as it tries to permeate across a membrane.
I dunno whether CO2 will go flat faster than N2 filled tire. CO2 has a molar weight of 12+16+16=44 while nitrogen is 28. assuming both act as an ideal gas up to 100psi (PV=nRT law)... how much more does CO2 filled tire weigh than with N2?? if someone can figure out what n, number of moles to fill up a tire, then we would know the difference in weight. my P-Chem book is burried somwhere in the garage. And I'm in no mood to go look up the conversion factors and the value of ideal gas constant R...
Anyway, not sure which would leak faster. And that's my answer. Answer from your LBS sounds fishy.
smilingcat
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10-05-2008, 07:03 PM #14
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Last edited by smilingcat; 10-05-2008 at 07:07 PM.
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