Re: Nitrogen (again)

Mike Hunter wrote:
All compressor have driers that remove the water precipitated by the heat of compression, when proper maintained. LOL

Actually, no. First, heat doesn't cause water to precipitate or condense. Heat will cause water to evaporate. Second, compression increases the concentration of water. For example, if the compressor increases the pressure to 150 psi, then the amount of water in a given volume is increased by a factor of 10 (from 14.7 psi to about 165 psi - the 150 psi is 150 psi above regular air pressure). That's because the compressor literally squeezes everything in the air into a smaller volume.

Jeff


"Tegger" <invalid@xxxxxxxxxxx> wrote in message news:Xns9CA8BBE5FC02Ategger@xxxxxxxxxxxxxxxx
dr_jeff <utz@xxxxxxx> wrote in
news:_pKdnZ3BAMbVEUbXnZ2dnUVZ_vednZ2d@xxxxxxxxxxxx:

Mike Hunter wrote:
As someone said the air inside the tire, as well as the air OUTSIDE
of the tire, is already nearly 80% nitrogen. ;)
Air has something that nitrogen doesn't have: water. Water can
condense or evaporate, causing changes in the pressure of the tire
faster with air than with nitrogen.


But you can get water-free air. That's what the FAA specifies for aircraft
tires when nitrogen is not available.

Any garage with a drier on their compressor can provide water-free air. Dry
air is what any garage /should/ have, because it prolongs the life of air
tools and helps keeps them from spitting oily goop all over the place.


However, the difference is pretty small; IMHO, not worth the extra
cost. (Note: If you're a NASCAR crew chief, please disregard what I
said. The differences are important for NASCAR cars.)


And for aircraft, whose tires may need to go from -100F to 100F in an hour.

Nitrogen, for road-going passenger cars, is a nice frill (especially with
those funky green valve caps), but far from essential for safety or
anything else.


--
Tegger



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