Quote:
Originally posted by tecoyah
If anything it would be something like 0.00000001 milligrams heavier due to increased air pressure
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The increased air pressure would not cause the object to be heavier. This is because air pressure acts on all the surfaces of an object. So if the air exerts a force on the top of the object, it will exert a (roughly) equal force on the bottom of the object. Especially if it is a small object. Not talking about skyscrapers here.......
An object would weigh (not mass.. weight) as much in a high pressure chamber at (lets say.. ) sea level, as in a vacuum chamber at sea level.