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On Sat, 27 Aug 1994, Jason Turner wrote: > > I have a question for the net that has been stumping me for a while. It > goes like this... > > 1) Your decompression ceiling is decided by your supersaturation level. > 2) Supersaturation is defined relative to the partial pressure of the > inert gas in question (eg N2, He, whatever). > > So what the heck is going on when one switches to a hyperoxic mixture > while on a deco stop? My dilema is this: Say I do an air dive with such > a profile that I have a 20 ft deco ceiling. I go to 20 ft and hang out > for a while. My tissues are loaded with N2 to the point that reducing > the PN2 below the ammount that air at 20 ft produces (about 1.27 ata) is > not a good idea. The supersaturation level would be too high any > shallower. Now, to reduce deco time, I can switch to a Nitrox > blend. Say I switch to EAN-50. This brings my PN2 to 0.80 ata, which is > about the same a surface air. What makes this different, from a deco > theory perspective, from a direct ascent to the surface? Or is it just > that one bubbles, but 20 ft underwater is enough to keep it > sub-symptomatic? Very confused. Any ideas? > Jason > jturner@un*.ub*.ca* > Please give generously to help the .sig challenged > Total ambient pressure keeps the bubbles in solution. You are soda bottle that has been midldy agitated "The cap is still on the soda bottle" at 20 feet ascending to the surface would remove the cap and you would FIZZ. Ronnie Bell using DECOM in Arlington Virginia
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