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REGISTER or LOGIN: QuoteModern 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.I assume it could be useful for races only, where tires undo very high friction and strains.
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.