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Originally Posted by ChrisZang
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I just read that article... wow my fours years of engineering college were a waste of time. Why did I attend those thermodynamics and fluid classes, when an article wrote by a journalist major explains it all in 5 paragraphs.
Air, Nitrogen, Oxygen, Argon, Hellium are all gases under pressure: PV=nRT. I will agree that compressed air will have a water content compared to a ideal gas, but we ain't talking about no rocket science when it come to filling up a tire. And a good compressed air system will dry the air removing most of the water vapor. They talk about how the Oxygen permeates the rubber... but race tires spend most of the life sitting on a shelf in normal air.... without being mounted onto a rim.
NASCAR uses Nitrogen because is doesn't "feed" a tire fire .... safety.