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If that is so then i stand corrected but i'm still left explaining to my non-freediving mates what is what - difficult at the best of times
Is it just me? I've got nothing against the bloke but a freediver he is not.
Yes, sorry, I know, it is long and full of redundant posts, so it's not funny reading through it. Try reading this one, it describes the main differences: http://forums.deeperblue.net/710157-post62.html (post #62)Teach ME to be lazy and not go through the whole thread!
I just want to correct my statement: the five time ratio is valid for comparing air with oxygen outside the lungs. When in lungs, the the hypothetical maximal partial pressure of O2 in air is 160 mmHg (21% from the atmospheric pressure of 760 mmHg). In reality it is significantly less: typically around 100 mmHg, in rest little bit more, and with hyperventilation it can raise to some 130 - 140 mmHg (possibly slightly more with very strong hyperventilation).I do not know what information exactly you are looking for, but your listeners may want to know that air contains 21% of oxygen (it is ~20% once you start inhaling it, because of the added water vapor). It means 5 times less oxygen than if you inhale pure oxygen.
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