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Why is it impossible to pump water from very deep in the ground with a surface pump?

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Water in a pipe that is being sucked up by a suction pump, is actually being pushed up by the air pressure. Therefore the weight of the water in the pipe cannot be stronger than the atmospheric pressure against the bottom of the water column.

A column of water taller than 10 m is.

A Really Long Straw - Scientific American

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Description:Remove more air, and a bigger difference in air pressure will cause the water level to rise even higher into the straw. Once the air is removed, the discharge valve can be opened to initiate syphoning. Now hold your straw vertically or close to vertically and try to drink with it. You can also come back to these steps during the process in case you need more straws for your mega-straw. It is clear that series connection of pumps has no effect on efficiency or discharge but doubles the effective head.

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Views: 3017 Date: 2018-06-18 Favorited: 16 favorites

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