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> >This is the "Steady State" Semi-closed equation, and applies to constant > >mass-flow type semi-closed rebreathers. It assumes a constant workload > >(metabolic rate), constant loop volume, and that inert gas absorbed by the > >body and other constituaents in the loop are negligible. > > > > Rich, could you please give me the formula for what the stock > market is going to do tomorrow, and will this work down at Calder > Race track as well? - G George's point is very well taken. I provided the formula, but that doesn't mean the formula has any representation of reality. I want to start up the "don't put too much faith in numbers" thread, but we've heard it all before. If you read my report on the PNG trip, you'll know that my diving partner and I have very different metabolic rates, even at the same workload. With the enormous range of physiological variability in the population, precise numbers having to do with such things as decompression schedules, oxygen toxicity, FiO2 inside a semiclosed rebreather loop, scrubber canister durations, etc. etc. etc., are silly and potentially dangerous. You have to look at formulas and numbers in diving as rough guides at best. So, yes, that formula is the formula for calculating steady-state FiO2 in a constant mass flow type semi-closed rebreather; however, it's only as useful as you have confidence in your metabolic O2 consumption rates at various workloads. From my experience, I would have very little confidence in my own metabolic rates for using such a formula. Aloha, Rich P.S.: ******************************************************************* "WHATEVER happens to you when you willingly go underwater is COMPLETELY and ENTIRELY your own responsibility! If you cannot accept this responsibility, stay out of the water!" *******************************************************************
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