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This is from:http://ezinearticles.com/?Selling-Nitrogen-In-Tires---Is-It-All-A-Lot-Of-Hot-Air?&id=38142The earths atmosphere is composed primarily of Nitrogen (78%), the remaining balance is a mixture of Oxygen (21%) and a small percentage of Ozone, Argon and Carbon gases. Isnít it ironic that the very gas (oxygen) that sustains life also causes organic materials to decompose and metals to rust?Remove The Oxygen And Stop The RotTo stop this decomposition you simply need to remove the oxygen from the Ďairí. (Incidentally, removing oxygen also means that you remove water because water is two parts Hydrogen gas, and one part Oxygen gas.)Removing Oxygen from products is not new, we do it all the time with our food and drink. In fact, if we did not remove the oxygen our food would not likely last long enough to make it into the hands of the consumers Ė or it would taste stale and unappealing.Nitrogen In TiresHere are a few other benefits of using Nitrogen in tires: Nitrogen is denser than Oxygen
This means the larger molecules escape less easily from tires resulting in a more gradual loss of pressure over time. According to the Michelin Tire Manual, a tire that is inflated with Nitrogen loses its pressure 3 times slower than if it were inflated with air. Nitrogen is moisture free: Pure Nitrogen inflated tires experience less steel belt and rubber degradation. Nitrogen use also reduces valve and wheel corrosion. Nitrogen provides longer tire life: Nitrogen inflated tire run cooler and require less maintenance according to the Goodyear application bulletin. Nitrogen is non-flammable: Nitrogen technology has been used in aircraft, military and race car technology for over thirty years.[/color]In this article they quote tire companies, so who knows if their information is valid. It makes sense that it would cause less corrosion by removing the oxygen, and that they stay inflated longer. However, they don't mention that it gives you better gas mileage.I think that might have been false advertising ... What about trying Helium??(No oxygen, Nonflammable, and Lighter than Air)
Modern applications...Filling automotive and aircraft tires due to its inertness and lack of moisture or oxidative qualities, as opposed to air, though this is not necessary for consumer automobiles.
No, it's lighter: N2 molar mass = 28; O2 molar mass = 32.
 Nitrogen is non-flammable: Nitrogen technology has been used in aircraft, military and race car technology for over thirty years.[/color]
I think I have heard something about filling tyres with noble gases.
You're right that nitrogen is not a noble gas, however, noble gases are smaller, not larger than N2 or O2.
I rather doubt that there are any physical differences between air and pure N2, since N2 and O2 are very similar in size and shape (both diatomics, with N having a slightly larger atomic radius). Thus, both should respond to temperature changes virtually identically. Even the pressure in tires (sorry, American spelling  ) is only 2-2.5 times atmospheric pressure, not enough to cause deviations from almost-ideal behavior.The only advantage I can think of is reduction in chemical oxidation from removal of oxygen, but that seems unlikely to have much effect when the rest of the car is fully exposed to air.
"As it's already been said, I assume a great advantage is the absence of water wapour."How come? What harm will water do?Personally I assume someone is out to make a fast buck.
Could be, particularly if you use a foot pump to fill the tyre normally, but most of the compressors I have seen would provide air that had been somewhat dried (if only because the storage pressure would be higher than the delivery pressure).At any rate that's an argument for dry air, rather than nitrogen. Dry air is a lot cheaper than N2.
No, it's "somewhat dried (if only because the storage pressure would be higher than the delivery pressure)."But then again, practically nothing is totally dry.