Nitrogen (again)
in [Toyota]
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From: Sharx35 on 20 Oct 2009 00:24 "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. Great life. Having to wear an oxygen mask in your own house.
From: dr_jeff on 23 Oct 2009 23:22
Tegger wrote: > 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? No. It is only the concentration of O2 that matters (in terms of grams per liter) that matters, not the concentration of other gases. |