Reg Braithwaite
Contributor
I'll try again...
I understand this to be the case for air. The PPN2 of air on the surface is .79, and my tissues are in equilibrium with this. When I descend below the surface, the PPN2 in the compressed air I breathe rises above .79 and N2 is absorbed into my tissues.
What happens if I dive EAN40 to a depth of 13'? The PPN2 I breathe at 13' is also .79 even though the ambient pressure is roughly 1.3 ata. Do my tissues absorb N2? Or is there no change?
And what happens if I breathe pure O2 for an extended 20' rebreather dive like the WWII frogmen? Do my tissues actually off-gas N2 since the PPN2 is zero? And do I therefore on-gas N2 when I return to the surface, the opposite of what usually happens after a dive?
It's impossible to completely reach equilibrium with 1ATM without actually being at 1ATM. In other words, if there is water above you, there's some decompression left to do.
I understand this to be the case for air. The PPN2 of air on the surface is .79, and my tissues are in equilibrium with this. When I descend below the surface, the PPN2 in the compressed air I breathe rises above .79 and N2 is absorbed into my tissues.
What happens if I dive EAN40 to a depth of 13'? The PPN2 I breathe at 13' is also .79 even though the ambient pressure is roughly 1.3 ata. Do my tissues absorb N2? Or is there no change?
And what happens if I breathe pure O2 for an extended 20' rebreather dive like the WWII frogmen? Do my tissues actually off-gas N2 since the PPN2 is zero? And do I therefore on-gas N2 when I return to the surface, the opposite of what usually happens after a dive?