Nitrogen filled tires & tires for sale spam

Mark Holden mark at mnautosport.com
Sat Jun 24 22:40:34 CDT 2006


Tim Rogers wrote:
> Err, almost.
> Water vapor is usually still a vapor when its in your tires but it has a
> much higher coefficient of expansion (meaning that for every degree of
> temperature increase, it expands more than either N2 or O2) so it is
> almost
> exclusively responsible for the pressure change as the tire heats up.

Very true.  I oversimplified it because people always complain that
PV=nRT so water vapor should expand at the same rate as any other gas,
when of course, (P+a(n/V)^2)(V/n-b)=RT.

All clear now, right?

:)


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