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>>Here, in some (few) learned talks about breathing oxygen, be it during hyperbaric treatment or loooong deco stops, the concept of "air break" is mentionned throughout. One will recall that ye olde apollo spaceships that sailed to the moon many moons ago did sport a 1/3 bar 100% oxygen atmosphere for the comfort and convenience of their valiant (but cramped) crews. The question is how did the guys who were cooped-up in those tin cans for days or weeks cope with the issue of oxygen toxicity? They certainly could not take air breaks, for this would have reduced the ppO2 below what normal lungs consider useful.<< As you stated the pressure within the capsule was only 1/3 bar, therefore the Ppo2 will only be 0,33 bar while breathing 100% O2, which is not harmfull during extended exposures. As you might know the oxygen becomes harmful above 0,5 bar Ppo2. Regards Patrik .................................................................. Patrik Brusheim Moranv. 33 98145 Kiruna Sweden p:+46 980 61240 email: patrik.henrik@ki*.ma*.te*.co*
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