Re: Oxygen

Date:         12 May 99 02:48:51 
From:         wb8foz@netcom.com (David Lesher)
Organization: NRK Clinic for habitual NetNews Abusers - Beltway Annex
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timma <downert@uwm.edu> writes:
>Can anyone tell me how we survive breathing oxygen above 12K in aircraft
>without oxygen masks??

A) You're breathing air, not O2.

B) You survive because the cabin is pressurized to higher
pressure/lower altitude.

Now, if/when the pressurization fails, you DO use the mask and
do breath O2.  That works because of "partial pressure"...

Let's say sea level air is 30% O2. So its partial pressure is
one Atm * 0.3[pp]. You get .3Atm's worth of O2.

So you can go up to an altitude where you have .3Atm * 1[pp] and
get the same results.

(Now, figuring out what altitude gets you .3 Atmospheres is left as
an exercise for the student...)
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