Air is 79 mole % Nitrogen. Therefore air has properties roughly portional to 79% of nitrogens properties. Actually Nitrogen has a very low heat capacity therefore it's pressure will be affected by heat input slightly more than air. A given heat input will increase the temperature of Nitrogen slightly faster than air as a result the pressure will also increase slightly faster at a given heat input. This may be the actual reason Indy cars (assuming they do) use nitrogen. They will reach steady state, thermal equilibrium, faster. Therefore after the tires will reach a steady performance level faster. It may also be to prevent oxidation of the rubber on the inside of the tire at high temperatures. Remember that different rubbers are used from the inside to the outside of the tire. All I can tell you for sure is that Nitrogen will react to heat slightly more than air. Jim >>> Nick Schade <schade_at_guillemot-kayaks.com> 08/27/98 02:21pm >>> At 7:00 AM -0500 8/27/98, M. Lenon wrote: <snip> and does not react to temperature >changes, thus maintaining an even pressure. (In motorsports, Indy cars, for >example, use nitrogen in their tires, rather than air. That way, hot or cold >tire temperatures do not affect the inflation pressure because the nitrogen >doesn't expand when the tires are running at their normal 200+ degrees >operating temperature. Tire pressure greatly affects handling. Neat, huh?) Whatever happened to PV = nRT. I thought this applied to all gases. If the temperature goes up, either the volume has to increase or the presure does. Nick Schade Guillemot Kayaks c/o Newfound Woodworks, 67 Danforth Brook Rd, Bristol, NH 03222 (603) 744-6872 Schade_at_guillemot-kayaks.com http://www.guillemot-kayaks.com/ >>>>"It's not just Art, It's a Craft!"<<<< *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ *************************************************************************** *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ ***************************************************************************Received on Thu Aug 27 1998 - 13:08:47 PDT
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