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[Don Bowen <don.bowen AT earthlink.net>]

On 6/17/2012 9:41 AM, WILLIAM JONES wrote:
> But even one bottle is capable of generating about a pound of buoyant force, 
> since the air expands by about 10%, or one cup.
Only if the bottle expands.  Pumping in 10% more air or even taking it 
out will have little affect on the buoyancy of the bottle.  That is 
dependent on the weight of the water displaced.

--
Don Bowen           KI6DIU
http://www.braingarage.com/Dons/Travels/journal/Journal.html