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In a message dated 2/9/99 7:29:48 PM Central Standard Time,
ststev@un*.co* writes:

<< 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. >>

5.9 lbs/ 77.4 cu ft = .075 lbs/cu ft  NOT 0.0749
When dealing with measured quantities and you multiply or divide two numbers
the result cannot have more significant figures than either of the first two
numbers.  From a practical standpoint, two significant numbers is quite enough
for the purpose of dive planning.

Good diving,
Cpt. Dale Bennett
Captain Dale's Dive Center
Enterprise Marine Dive Charters
CaptnDale@ao*.co*
www.captaindales.com
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