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Old 08-16-2011, 03:08 PM   #41 (permalink)
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Old 08-16-2011, 05:37 PM   #42 (permalink)
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Old 08-16-2011, 10:34 PM   #43 (permalink)
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^ What HE said!
No common gas can violate the Ideal Gas Law. Not even the most abundant gas on our planet.
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Old 08-17-2011, 06:42 AM   #44 (permalink)
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One aspect that hasn't been mentioned when folks talk up nitrogen inflation is that there's this pesky little thing called tha Law of Partial Pressure of Gases - also known as Dalton's Law. It states that if you have a mixture of gases, each gas behaves according to its percent by volume in the mixture.

Air is 21% oxygen, so oxygen acts like it's at 3.1 psi (14.7 X 0.21)

Where that plays out in tires is that even if a tire is completely filled with 100% nitrogen, oxygen is going to permeate back into the air chamber - and eventually the air chamber will stabilize at 3.1 psi oxygen. Put another way, if a tire is inflated to 31 psi with 100% nitrogen, eventually the air chamber will be 10% oxygen.
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Old 08-17-2011, 06:44 AM   #45 (permalink)
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Quote:
Originally Posted by roflwaffle View Post
What a load of manure.

The loss rate - either of O2 and N2 - is so low that a tire can't be used as a sifting method (i.e. molecular sieve).

If you wait a year without checking tyre pressures, the difference will be 1.3 psi.

WOW , I'm totally underwhelmed.
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Old 08-19-2011, 12:26 PM   #46 (permalink)
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I know what you mean, when you look at the real numbers it's like 1.3 psi difference in a 30 psi tire after 1 year, why even bother to make green valve caps? I mean seriously, the nitrogen fill means I have to hold the air nozzle on the tire for 2 fewer seconds? I don't even know what I'd do with all that extra time anyway!.....But statistically, it is a 156% Difference between the 2 inflation methods.

Both are absolute facts, but the way the data is presented makes a huge difference. This is why I'm always Very, VERY, VEEERRRY skeptical of random "facts" that are thrown at me. People invariably slant the "Data" presentation to make it seem like a bigger issue than it is. The 156% number makes it seem like your tire is not only going to leak out all its air, but you'll have to fill it half as much again, and it'll leak all that too.

These statistics numbers are used on death rates all the time too, your 300% more likely to die from eating pizza as opposed to corn flakes (or whatever). Then the numbers are shown, 1 person in 100,000,000 will die from corn flakes, 3 in 100,000,000 will die from pizza.

If you're reading this, Always be Skeptical of numbers until you see the raw data, it will increase your chance of survival by 1,895% and your love life will be 693% better, except for the people who don't survive, their love lives would be 1,313,235% worse. Give er take.
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Old 08-19-2011, 01:06 PM   #47 (permalink)
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I posted this over on a different forum regarding this topic:

Don't ever pay for Nitrogen filling. Air is ~78% Nitrogen. *IF* Nitrogen was "bigger" and leaked out more slowly than "air," over time, everything except that 78% N would leak out. So then, your tires would be 78% full pressure, but 100% full of N. Pump 'em up with air again, and you're adding 78% Nitrogen again, to give you 95% N (78% + (78% of 22% = 17%). So after two fills with air, you'd be at 95% N. A third fill would bring it to 99%.
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Old 08-19-2011, 05:16 PM   #48 (permalink)
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I don't know why I haven't posted my web page on the subject, but here it is:

Barry's Tire Tech
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Old 08-19-2011, 06:18 PM   #49 (permalink)
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Old 08-20-2011, 04:41 AM   #50 (permalink)
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What the N2 supporters often forget, is that the outside half of a tire is still exposed to O2 in the air - and the sun.

Properly inflated, tires will wear on the thread and on the sidewalls - dry rot.
The inside of any tire I've seen coming off my cars looked pristine, even after 7 years and 100.000 miles.

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