nitrogen in tires was: aluminum wheels

[Andrew Duane USG]

Hairy green toads from Mars made Dave Hord say:

> Helium is pointless in tires..but yes, nitrogen CAN be used and DOES have
> an advantage.  Filling your tires with pure nitrogen essentially ensures
> there is no residual water moisture in the tires at the time they are
> filled up.  Due to the fact that there is no water moisture, your tires
> will not increase their pressure much with heat.  Thus, a tire filled at
> 32psi with nitrogen when cold will be closer to 32psi when hot, then a tire
> filled with just normal 'air'.

Expansion of gasses at temperature has to do with Boyles law, not
water vapor in the gas mixture. Why would nitrogen not expand as
it gets warmer? Am I missing something?

--

Andrew L. Duane (JOT-7)			duane at zk3.dec.com
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