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What is siphon? On what principle it works?
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  • Siphon is a long bent pipe which is used to transfer liquid from a reservoir at a higher elevation to lower elevation when the two reservoirs are separated by a hill or high level ground. enter image description here

    • The point C which is at the highest of the siphon is called summit as shown in fig. As the point C is above the free surface of the water in the tank A, the pressure at C will be less than atmospheric pressure.

    • Theoretically, the pressure at C may be dropped to -10.3m of water but in actual practice this pressure is only -7.6m of water or 10.3-7.6=2.7m of water absolute.

    • If the pressure at C becomes less than 2.7m of water absolute then dissolved and other gases would come out from water and collect at the summit.

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