I just read this: "The main reason that some repair shops and other automotive professionals choose to fill tires with nitrogen is to reduce a temperature swing’s effect on tire pressure. “Nitrogen isn’t as susceptible to temperature changes as oxygen,” says Karl Brauer, senior director of content for Kelley Blue Book. “But our air has 78 percent nitrogen in it already, so you’re not getting that much of a benefit from pure nitrogen versus regular air.”
Nitrogen does offer some advantages over regular compressed air when filling tires. Since the molecules that comprise nitrogen’s chemical structure are larger than oxygen’s molecules, nitrogen is less likely to seep through rubber, the prime culprit for deflated tires. This keeps the tire pressure more stable over the long term, especially during extreme variations in temperature. “Nitrogen-filled tires are less susceptible to temperature swings, so the tires are more likely to maintain constant pressure under a wide variety of temperatures and vehicle speeds,” says Ed Kim, vice president of industry analysis at automotive research firm AutoPacific. “Part of this is due to the intrinsic qualities of nitrogen over air, but part of this is also because air has water vapor in it (humidity), and humid air is also more susceptible to pressure changes as a result of temperature.”" But I don't remember Boyles law being different for different gases. Are the thermal expansion coefficients different for N and O? -- OK Don *“Travel is fatal to prejudice, bigotry and narrow-mindedness, and many of our people need it sorely on these accounts.”* – Mark Twain "There are three kinds of men: The ones that learns by reading. The few who learn by observation. The rest of them have to pee on the electric fence for themselves." WILL ROGERS, *The Manly Wisdom of Will Rogers* 2013 F150, 18 mpg 2012 Passat TDI DSG, 44 mpg 1957 C182A, 12 mpg - but at 150 mph! _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
