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This mail appears to have got lost in the server breakdown yesterday. My apologies if people receive it twice. Chris Mayer wrote: >Actually, from what I understand the lungs are quite capable of >compressing to a small fraction of their full volume. This makes >physical sense too: >Assume a square foot of combined chest and back area >(conservative). >Then to hold your lungs at 1 bar at 30m you need: >12^2 inches * 3 atm * 14.7 lbs/(in^2 atm) = 63504 lbs. pressure A couple of comments, (i) I wasn't advocating that there was no compression of the chest at all, just that there would be a difference. How big a difference is the real question. I was questioning the validity of obtaining any useful data by taking a deco gauge with you when snorkelling - see below. (ii) Your arithmetic calculation is a factor of 10 out. (presume -typo) (iii) I was thrown by your calculation at first, but what you mean is there is a *force* of 6350.4 lbs not a pressure? (I'm just not used to your units). I take your point though, this would equate to nearly 3 tonnes sitting on your chest. Ouch!! The pressure differential would therefore be small. The deco gauge would give an indication of decompression requirements, but presumably would not take into account micro bubble formation. The cause of Free Diver DCS? Bearing in mind that the best free divers go to depths in excess of 70m, how deep would you have to go before suffering a collapsed lung? Ken ------------------------------------------------------------------ Most things are simple it's only people that make them complicated ------------------------------------------------------------------
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