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what is bouyancy?

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bouyancy? It is the effect of a fluid medium (air, water, etc) to exert upward pressure on another object. Gravity pulls on the fluid as well as the other object, and due to Pascal's principle, force in a fluid medium is transmitted in all directions, included upward. http://hyperphysics.phy-astr.gsu.edu/hbase/pbuoy.html

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