[PSUBS-MAILIST] Forces of Nature

["Joseph Perkel" <joeperkel@hotmail.com>]

My learning curve is flattened again, too many distractions, Please help me with some basics here.

#1 One submerges a bubble of air (enclosed in any material) and open to ambient pressure to 1atm . Equal forces of pressure are applied to either side of the material. I assume that the lifting force of the air in pounds of buoyancy is not cancelled out by the equalization of that pressure. That the material is subjected to a stress in psi equal to that force. Then if one were to apply an opposing force ,as in ballast, that the material is then subjected to both forces. Is this a correct assumption?

#2 One submerges a piece of marine ply to one atm. Is the cellular structure of the wood irreversibly compressed creating a permanent change in density and therefore buoyancy?

Thanks

Joe

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