Is nitrogen exempt from the Ideal Gas Law? - Saab General Bulletin Board - Saabnet.com
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Do you recall PV=nRT, the Ideal Gas Law, from chemistry class? There is a linear relationship between tire pressure and temperature (OK, Absolute temperature in degrees Kelvin, but it's still relevant); the rule of thumb is that tire pressures decrease by 1 psi for every ten degree Farenheit temperature drop.
Unless you live in an area with steady temperatures, i.e. San Diego, I find it difficult to believe that you have not had to add any air or nitrogen to your tires since purchase, yet they still have the same tire pressure - unless they were purchased quite recently or the temperature that you measured them at is the same as when you bought them. Here in the frosty midwest, we have been experiencing temperature swings of as much as 70+ degrees F over the past month!
posted by 12.151.249...
Ideal Gas Law
Posts in this Thread:
- Anyone use nitrogen in their tires??, -993-, Wed, 21 Jan 2009 21:38:56
- Anyone with Tire Pressure Monitor system?.., AlS, Thu, 22 Jan 2009 14:24:36
- Oxidation., dmz789abc, Thu, 22 Jan 2009 12:22:13
- Yes, 80%, all the time., LesH, Thu, 22 Jan 2009 10:26:32
- Car and Driver magazine a while back said . . ., nnsquared, Thu, 22 Jan 2009 07:54:03
- Snake oil!, Noel, Thu, 22 Jan 2009 05:27:40
- Re: Anyone use nitrogen in their tires??, C H Tay, Thu, 22 Jan 2009 01:55:48
- I tried that..., AlS, Wed, 21 Jan 2009 22:45:21
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