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From: dr_jeff on 19 Oct 2009 17:45
Mike Hunter wrote:
> Did it ever occur to you dr., that although the air inside the tire, as well
> as the air OUTSIDE of the tire, is already nearly 80% nitrogen, that there
> is far more water OUTSIDE the tire than is ever INSIDE the tire? LOL

Yeah. I know that. And I have said that. But the concentration of the
water changes.

Jeff

> "dr_jeff" <utz(a)msu.edu> wrote in message
> news:_pKdnZ3BAMbVEUbXnZ2dnUVZ_vednZ2d(a)giganews.com...
>> 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. And, water can also be absorbed and released by the
>> rubber of the tire. So tires that are filled with nitrogen tend to
>> maintain a steadier pressure than tires filled with air.
>>
>> 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.)
>
>
From: larry moe 'n curly on 19 Oct 2009 19:39


Tegger wrote:
>
> And even "pure" nitrogen is never purer than about 95%, which is all
> commercial nitrogen generators are capable of making.

Safety tip: If you increase the air pressure of your house to 30 PSI
only by adding nitrogen, your house will become virtually fireproof.
From: dr_jeff on 19 Oct 2009 19:48
larry moe 'n curly wrote:
>
> Tegger wrote:
>> And even "pure" nitrogen is never purer than about 95%, which is all
>> commercial nitrogen generators are capable of making.
>
> Safety tip: If you increase the air pressure of your house to 30 PSI
> only by adding nitrogen, your house will become virtually fireproof.

No it won't. It's not the percent of oxygen that is important, but,
rather, the concentration of oxygen, in terms of grams per liter. You
can add all the N2 you want, but there will still be the same
concentration of O2.

Jeff
From: Tegger on 19 Oct 2009 21:06
dr_jeff <utz(a)msu.edu> wrote in
news:y8ednXAVIIcyZ0HXnZ2dnUVZ_qOdnZ2d(a)giganews.com:

> larry moe 'n curly wrote:
>>
>> Tegger wrote:
>>> And even "pure" nitrogen is never purer than about 95%, which is all
>>> commercial nitrogen generators are capable of making.
>>
>> Safety tip: If you increase the air pressure of your house to 30 PSI
>> only by adding nitrogen, your house will become virtually fireproof.
>
> No it won't. It's not the percent of oxygen that is important, but,
> rather, the concentration of oxygen, in terms of grams per liter. You
> can add all the N2 you want, but there will still be the same
> concentration of O2.
>



Let's see now....

Atmosphere is 78% nitrogen, 21% oxygen and 1% funny stuff.
78+21+1=100

Let's call it 100 parts per given volume.

Now if you double the pressure using ONLY nitrogen, that becomes 200 parts
in the same volume, so
178+21+1=200

The /concentration/ of oxygen per unit of dimensional space (liter) in the
second case would be exactly the same as in the first, but there'd be a lot
more nitrogen molecules between the oxygens. This would mean that a flame
front would have to kick and punch its way past more than twice as many
inert nitrogen molecules in order to propagate its conflagration. Not
exactly "fireproof", but wouldn't combustion therefore be more difficult to
achieve?

--
Tegger

From: Mike Hunter on 19 Oct 2009 21:07
Would your sealed container home, pressured up at two atmospheres, NOT
already be fire proofed? LOL


"larry moe 'n curly" <larrymoencurly(a)my-deja.com> wrote in message
news:3df08e33-882d-43f4-b979-0598e8749deb(a)v15g2000prn.googlegroups.com...
>
>
> Tegger wrote:
>>
>> And even "pure" nitrogen is never purer than about 95%, which is all
>> commercial nitrogen generators are capable of making.
>
> Safety tip: If you increase the air pressure of your house to 30 PSI
> only by adding nitrogen, your house will become virtually fireproof.


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