Re: Oxygen

Date:         18 Jun 99 01:39:45 
Organization: - Share what you know. Learn what you don't.
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  or MIME structure (David Lesher) wrote:
> timma <> writes:
> >Can anyone tell me how we survive breathing oxygen above 12K in
> >aircraft without oxygen masks??

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

Well, to be exact, if ypou are a passenger, you breath a mixture of O2
and cabin air. The mixing ratio is controlled through two valves in the
mask, one for oxygen, another for the air.

If you are a crew member, you may control the mixture ratio and the
other conditions of what you are breathing.

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