G,
     I think Dean meant to say "Deco dry" (as in the habitat) vs in-water.
To answer that question- yes, we seem to be able to tolerate much higher
oxygen exposures dry than wet. This is pretty well documented in Oxygen and
the Diver and SOP in deco chambers.
C.

Chris Elmore
34°02'24"N, 80°58'55"W
(803) 348-3055 mobile

----- Original Message -----
From: "George Irvine" <trey@my*.ne*>
To: "Dean Laffan" <email@re*.co*.au*>; "techdiver"
<techdiver@aquanaut.com>
Sent: Friday, September 06, 2002 6:36 AM
Subject: RE: O2 exposure


> Air does not really work or give any leverage. Just imagine the offgassing
> curve with like gases on both sides. It is bad enough with unlikes. You
want
> to get all the gas out that you can in the early part of each step by
virtue
> of the reduced gradient, the bulk of which will be over fast, and then the
> rest of the advantage at that point is due to the oxygen window. Oxygen (
> partial pressure of oxygen) also more rapidly dissipates whatever bubbles
> are present, and of course is transported with or without the bonds at
high
> ppo2s.
>
> Proper uses of the gases is what allows us to benefit from them inwater.
>
>
> -----Original Message-----
> From: Dean Laffan [mailto:email@re*.co*.au*]
> Sent: Friday, September 06, 2002 1:40 AM
> To: techdiver
> Subject: Re: O2 exposure
>
>
> on 6/9/02 10:27 AM, George Irvine at trey@my*.ne* wrote:
>
> >  We are also getting a huge advantage being in air for that part of
> > the deco, rather than in water.
>
> George I have often heard that it is safer to deco in air and that is less
> risk of toxing while not immersed. Is there much to say about the reasons
> why it is such a huge advantage ?
>
>
> Regards
>
>
> dean  laffan
>
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