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this discussioin got so technical i had to ask my friend archimedes......he
said the lift of the tanks was equal to the weight of the water they
displaced. the bouyancy was this number minus the weight of the tanks and
the weight of the air in them.

since the water displaced and the weight of the tanks does not change the
only variable is the weight of air inside them ( i believe 13cuf = 1 lb ??)

weigh the empty tanks in water then subtract the weight of the air you put
in them

no this analysis does not take into account volume variations produce by
thermal expansion and contraction which will after this by something
multiplied by 10 to the -6

david


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