Slipstream - June 2012

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continued from previous page put pure nitrogen into your tires. I have also heard folks say that tire pressures are more stable with N 2 than with air. In order to get that engineering degree hanging on my wall, I had to pass a bunch of chemistry and physics classes. A favorite topic was gas behavior under varying temperature and pressures. Until you compress them or cool them sufficiently to the point that they are thinking about becoming a liquid, gasses, be they nitrogen, oxygen, carbon dioxide, or air, all behave according to the “ideal gas law” and its mathematical equation PV = nRT In a car tire, you can calculate the temperature of the gas by looking at the pressure change. For the purposes of this discussion, the “V” in the equation is the volume contained by the tire and wheel; “n” is the chemical amount of the gas in moles; “R” is the ideal gas constant; “P” is pressure, which can be whatever your tire gauge says (psi, kPa, bar); and “T” is temperature in degrees Kelvin, named after the dude that did all of this boring research in the 1800s. Water freezes at 32 degrees Fahrenheit, which is 0 degrees Celsius and 273 degrees Kelvin. If you have 36 psi in your tires and it’s 32 F outside, at 104 F (40 C, 313 K), your tire pressure increases to 41.3 psi, according to the equation Pi/Ti = Pf/Tf which in this example would be 36 psi/273 K = “X” psi/313 K And to end the suspense, solving for “X” results in 41.3 psi. All of this is terribly exciting! OK, maybe not. But think about how exciting it would be NOT to spend $40 to inflate your tires! 26
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Page 1 and 2: http://mav.pca.org Upcoming Events
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Page 7 and 8: Carey On... By Carey Spreen, Managi
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Page 13 and 14: March Sunday Drive: Vintage Flying
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Page 25 and 26: Member Spotlight: Cyndee Ebeling By
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Slipstream - June 2012

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