Can you turn a full glass of water upside down and not spill it? You need to try
a glass, water and a sheet of paper.Fill the glass to the brim with water and place it on the surface of the paper. Beware of attaching paper is the most important step in the attempt. Then turn the glass upside down. What will happen?
Water will not flow out, keeps in a glass with paper, because at "the bottom" effect atmospheric pressure. Anyway, so you can "keep" 10 m high water column, because the pressure 10 meters of water is roughly equivalent to atmospheric pressure.
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