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 -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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