I believe you'll find the following interesting:
Gay-Lussac and Avogadro's Law
* At a given temperature, the number of moles of a gas is directly
proportional to its volume.
* The molar volume of a gas, regardless of its identity, is constant
* n/V = constant (at constant T and P)
If one has a gas mixture, the partial pressure of each gas is proportional
to its number of moles.
The total pressure of the mixture is a simple sum of the partial pressures.
That is to say simply, there isn't enough difference in "air" and pure
nitrogen to see ANY difference in the expansion and contraction.
What you do see is a difference in the density of nitrogen and oxygen.
Nitrogen, being more dense, migrates less through other materials. And,
nitrogen doesn't cause oxidation of other materials which can eventually
lead to failure, but not likely in a common automobile tire.
Dry nitrogen is used in large aircraft tires all the time primarily because
of the much higher pressures involved and the fact that it will not migrate
through the tire material. It also will not support the oxidation of the
tire or wheel. For automotive applications, I can't see where it would make
a bit of difference to anyone except those SELLING THE IDEA that it will!
That is unless you're too lazy to check your tire pressures and are willing
to pay someone else large sums of money to take care of that minute task
for you.
Of course this really isn't a tire static issue ;)
73, Tony W4ZT
At 11:45 PM 11/17/2004, Butch Kanvick wrote:
>HI, Everyone
>The switchover to Nitrogen is sweeping the country, plus they offer free
>Nitrogen checks.
>Nitrogen molecules, do not expand when heated and they do not shrink when
>the temperature changes and the tubeless liner should not leak (lose)
>nitrogen as the compressed air does seep out of the tubeless liner.
>The tires lose about 1 pound of air per month. That is why the tire
>companies recommend that you check the air in your tires once a month and
>every two weeks during the winter months.
>I hope this helps.
>Butch
>
>From: "Rogers, Ron" <[EMAIL PROTECTED]>
>Reply-To: Repeater-Builder@yahoogroups.com
>To: <Repeater-Builder@yahoogroups.com>
>Subject: RE: [Repeater-Builder] radial tire static?
>Date: Wed, 17 Nov 2004 17:58:58 -0500
>
>
>Dave:
>I remember when this was a problem that seemed to surface years ago more
>with fiberglass belted radial tires than with steel belted........and
>also a problem with the older bias-ply tires.
>
>One thing I heard many years ago from one mechanic that really seemed to
>understand the problem was to wait for a rainy day with 80-90% humidity
>in the air, then one by one, release the air from your tires and
>re-inflate them with this "wetter" ambient air from your air compressor.
>If your tires didn't have any leaks then the air inside the tires would
>remain highly humid and keep the static bled off.
>
>But, I also understand that some sports car and luxury car "tire
>purists" are listening to the BS being preached from some tire dealers
>which recommend inflating with a dry gas (Nitrogen) to keep the Oxygen
>in atmospheric air from attacking the rubber content of the internal
>tire !! Of course, they want to charge a premium price to inflate your
>tires.
>
>Dry Nitrogen gas would tend to make for a terrible build up of static in
>a rotating tire.
>
>Ron
>WW8RR
>
>-----Original Message-----
>From: na6df [mailto:[EMAIL PROTECTED]
>Sent: Wednesday, November 17, 2004 4:12 PM
>To: Repeater-Builder@yahoogroups.com
>Subject: [Repeater-Builder] radial tire static?
>
>
>
>Not repeater related so much, but I thought the great minds here
>might know...
>
>One of my corporate bosses, a ham, is having his bridgestone tires
>generate static while they are rolling, interfering with AM radio
>reception. I know somebody used to sell a powder to put in the tires
>that dissapated the static, but can't find any info on it now. It
>has to do with some problem with "low rolling resistance" tires that
>have low carbon content..
>
>Any ideas? thanks!
>
>dave
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