RE: [Paddlewise] Waterproof Binoculars -Reply

N2 is used in tires, especially aircraft tires because it is inert and
doesn't burn. It's used in purging electronics and optics because it's
cheap and easy to produce and it's inert, so it won't promote any
rusting or corrosion. In addition, commercial N2 has a dew point well
below -50C...DRY!

cya

-----Original Message-----
From: owner-paddlewise_at_lists.intelenet.net
[mailto:owner-paddlewise_at_lists.intelenet.net]On Behalf Of Jim Martin
Sent: Thursday, August 27, 1998 4:07 PM
To: paddlewise_at_lists.intelenet.net
Subject: Re: [Paddlewise] Waterproof Binoculars -Reply


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!"<<<<


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