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Jody Svendsen writes: > > Tri-Mix is best to avoid when possible because for all but the longest > dive durations, it incurs a larger decompression penalty than Nitrox. > This is because you must sum the nitrogen and the helium in > the body's tissues when figuring decompression. This is a particular > problem in the slow tissues where the M-values are low. The slow > tissues rapidly load up with helium, and once a slow tissue is heavily > loaded, it takes a long time to get the gas out, particuarly if there > is more than one gas in the tissue. My understanding of Buehlmann's Decompression/Decompression Illness (and physics) is that the gases diffuse independently. Therefore, although He enters the body 2.65 times as fast as N2, it also offgasses 2.65 times as fast. With this in mind, I can't see the sense in your last sentence. Perhaps you meant to refer to the ideal decompression times that can be achieved by changing to heavier and heavier inert gases as you ascend? Cheers, David Story NAUI AI Z9588, PADI DM 43922, EMT story@be*.wp*.sg*.co* Better diving through computers.
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