nitrogen in tires was: aluminum wheels

[Huw Powell]

> > 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?

Yes, any *gas* in the tire will expand in that fashion.

But water droplets start as a liquid and if they heat up enough...
voila!  More gas... with much greater volume (or pressure) than the
liquid state.

I presume the "dryness" is assured because the nitrogen is coming out of
a cylinder from a plant where they specialize in that sort of thing. 

-- 
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/