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Water in a closed tube (see fig) is heat...

Water in a closed tube (see fig) is heated with one arm vertically placed above a lamp. Water will begin to circulate along the tube in counter-clockwise direction.

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On heating the liquid at `A` will become lighter and will rise up. This will push the liquid in the tube upwards and so the liquid in the tube will move clockwise i.e. form `B` to `A`.
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