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Mike, 

sorry for not being crystal clear -- hypoxic = less than 16% oxygen content
in my book. 

regards, 
jds 
 


At 11:38 PM 8/16/1999 -0400, Mike Rodriguez wrote:
>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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