Re: Oxygen

Date:         18 Jun 99 01:39:48 
From:         "John Weiss" <jrweiss@seanet*NOSPAM*.com>
References:   1 2
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Pressure breathing is only necessary above a cabin altitude of 30,000' or
so.  Below that, the partial pressure of 100% oxygen at ambient pressure (or
just enough above ambient for delivery) is sufficient.

John R. Weiss
Seattle, WA
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