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Brent is on target with his discussion of partial pressures of O2.  Don't
even think of using compressed air or Nitrox--neither will do you any good
in a reduced pressure environment.  Above 30K ft, even pure O2 is not
enough--at that point you need to add positive pressure breathing in
addition to O2 to even get close to normal partial pressure O2 in the
blood..
Douglas W. Johnson, MD, FACR
Florida Radiation Oncology Group
1235 San Marco Blvd, Jacksonville, FL 32256
Voice:  (904) 202-7020
Fax:      (904) 202-7029

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