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At 07:50 PM 8/16/99 -0400, Joel Silverstein wrote:

Hello Joel,

>That's not it -- they just dont understand that its not needed. They dont
>understand partial pressures, they dont understand that you dont need a
>hypoxix mix for a 250 fsw dive,

[SNIP]

Am I missing something here?  A normoxic mix at 250 fsw has a
PO2 of 1.8 AtA.  At 19.2% O2, the PO2 is 1.6 AtA and at 16.9%
it's 1.4 AtA.  To dive safely at 250 fsw, a hypoxic mix at no
more than 16.9% O2 should be used.

Now, 16.9% O2 is perfectly breathable all the way from the surface
to the bottom, of course, and reaches a normoxic PO2 just a few
feet below the surface so a travel mix is not needed and doesn't
makes sense on this dive, but the mix *does* have to be hypoxic
to be safe.

-Mike Rodriguez
<mikey@ma*.co*>

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