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Date: Thu, 28 Sep 1995 23:14:08 -1000
From: Anthony D Montgomery <amontgom@ha*.ed*>
To: joan coval <saphire@ix*.ne*.co*>
cc: chris@ab*.co*, techdiver@terra.net
Subject: Re: Nitrox and high altitude diving

joan coval wrote:

If using nitrox at high altitude, e.g., 12,000 feet above
mean sea level, I would think that the higher partial
pressure of oxygen would contribute toward a greater
possibility of hypoxia when surfacing relative to using
compressed air.  What would be other apparent trade-
offs of nitrox vs. air at altitude?  Advantages?




	How would HIGHER ppO2 contribute to hypoxia?  I don't think I 
understand the question.  Are you speaking of the differential ppO2 between  
nitrox and air after surfacing at altitude?  If this is the case, It shouldn't 
matter because the differential would be the same at any given altitude 
(0 or 20,000').
	Do you mean the reduction of ppO2 from your tank to the 
atmosphere?  Don't forget that the atmosphere pressure affects your 
overall ppO2.  So the reduction in ppO2 would be the same at sea level, 
right.  As long as the air at the altitude your diving could withstand 
life, it would be fine.  Please correct me, if I'm off track.

Aloha,
Tony

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