According to Luxfer, an aluminum 80 actually only holds 77.4 scu.ft. of
air at 3000 psi.  Their stated buoyancy characteristics for this
cylinder in salt water are -1.5 pounds full, +4.4 pounds empty,
yielding the weight of air (according to Luxfer), equal to 0.0749
pounds per cubic foot.

-Sean
 

On Tue, 9 Feb 1999 16:30:31 -0600 (CST), EE Atikkan wrote:

>You wrote: 
>>
>>All of my former openwater 1 students can answer that question for 
>>you, generally speaking it's roughly 0.06lbs per ft3. That's why an 
>>80 is 6-7lbs heavier full.
>>
>>Ken
>>
>
>U sure Ken?
>
>@ 0.06 lb/ft^3, an 80 would hold 80*0.06 = 4.8 lb
>
>Try O.075 ish.  
>
>Regards
>
>Esat Atikkan
>
> 
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