Upward Pressure

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A tube open at both ends with the lower end covered with a piece of card, plunged into the water. The liquid will press the card against the bottom of the tube with a force which increases as it is plunged deeper.


A. Privat Deschanel Elementary Treatise on Natural Philosophy Part I. Mechanics, Hydrostatics, and Pneumatics (New York: D. Appleton and Company, 1884) 88


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