Saw a Nitrogen sticker on a car. . .

Discussion in 'Off-Topic Chat' started by Texas42, Jul 24, 2009.

  1. Texas42

    Texas42 TGT Addict

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    I was walking through my parking lot at the Hospital and saw a sticker stating that the tires were filled with Nitrogen.

    I have no idea why. I think N2 might have a different density that could make the car drive better, but I have no idea.

    Any clue?
     


  2. baboon

    baboon Well-Known

    Supposed to give better mileage.
     
  3. Exile Machine

    Exile Machine Active Member

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    If I recall my high school chemistry, Air is 78% Nitrogen by volume. Nitrogen is not inert. It reacts with other elements to make things like fertilizer and ammonia, and DNA.

    I believe the whole "Fill your tires with Nitrogen" thing is a Scam. I use a specially formulated 78% mix of nitrogen, oxygen and trace noble gases. I get it for 50cents at the gas station from the AIR hose.
     
  4. kingofwylietx

    kingofwylietx Well-Known

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    You can pay extra to get Nitrogen in your tires. The only advantage is that it won't expand or contract as much as plain air. This is what they base the 'better fuel mileage' on, that they like to tout. However, your tires are designed to operate just fine on standard air when inflated to the proper pressure. It's a waste of money.......IMHO.
     
  5. Texas42

    Texas42 TGT Addict

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    All right, back to chemistry. PV = nRT

    I don't see how nitrogen would fluctuate any more or less than normal, mixed air, oxygen gas, or CO2. I don't believe the pressure is too high/ or the size in the molecules to be that different that you have to use the more comlicated formula (that I don't remember off the top of my head. I know it has a nother couple variables a and b that acount for the mass and volume of the molecules)

    ps- N2 is essentially inert. It requires special enzymes/catalysts to convert it to anything else at a reasonable rate. And only a few kinds of living things possess them. Legumes (sp?) and some bacteria.
     
  6. dee

    dee Well-Known

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    Pure nitrogen has no moisture either like compressed air which is better on your steel wheels. Also the expanding contracting has alot to do with it all tires will bleed off some preasure with time through the rubber and metal compounds. I have tried it and it works very well there is also a reason almost all your high end racers and race teams use it in their tires.
     
  7. navyguy

    navyguy TGT Addict

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    I'd never pay for it, but when we bought Paula's Camery, it came with N2 in the tires, and the dealer said they would refill them at no cost for as long as we owned the car. (probably salesman speak) We had to have a tire replaced, and I have never been back to the dealer to have them put N2 in.
     
  8. Texas1911

    Texas1911 TGT Addict

    May 29, 2017
    Austin, TX
    The tires on a race car reach 250 - 300 degrees on the surface on a hot track being pushed hard. Your car's tires on a 100 degree day are maybe half that at most.

    The reason race teams do it is to eliminate moisture from the system, and work with just gas. Nitrogen is a cheap gas, it works, isn't explosively flammable like hydrogen and oxygen, and the race engineers are happy.

    The nitrogen filled tires thing is a bit of a gimmick. The ideology is the N2 (two triple-bonded Nitrogen atoms) is less likely to diffuse through the tire carcass. There would need to be a HUGE disparity in porosity between the two gasses to really show a difference in a car tire.
     
  9. Texas1911

    Texas1911 TGT Addict

    May 29, 2017
    Austin, TX
    There is no method to avoid moisture. When the tire is mounted it is already containing 1 ATM of standard atmospheric gas.
     
  10. dee

    dee Well-Known

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    Thats why the nitrogen machine pulls all the air out then puts nitrogen in then does it again.
     

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