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#1
August 15th 05, 02:10 PM
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Brien K. Meehan opined
The "partial pressure of O2" has nothing to do with it. Your premise is wrong. Loss of cabin pressure IS what incapacitates pilots. The lungs need atmospheric pressure to exchange gasses with hemoglobin in the alveoli. It doesn't matter what gas it is - without the pressure, respiration stops happening. As altitude increases and pressure decreases, respiration becomes less effective. Below a certain pressure, you can suffocate on 100% oxygen. Seems to me that astronauts use 3psi of pure O2 during EVAs. -ash Cthulhu in 2005! Why wait for nature? 
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#2
August 15th 05, 06:11 PM
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Ash Wyllie wrote:
Seems to me that astronauts use 3psi of pure O2 during EVAs. -ash Cthulhu in 2005! Why wait for nature? Correct and 3psi of pure O2 is about the same as the ppO2 in Air at Sea Level. -- -------------------- Scott F. Migaldi CP-ASEL-IA N8116B PADI MI-150972 Join the PADI Instructor Yahoo Group http://groups.yahoo.com/group/PADI-Instructors/ --------------------
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