Physics
What is a submarine? How can it be made to dive in water and come to the surface of water?
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Answer
A submarine is a water tight boat which can travel under water like a ship and it is provided with water tanks.
To make the submarine dive, the tanks are filled with water so that the average density of the submarine becomes greater than the density of sea water, so it sinks into the water.
To make the submarine rise to the surface of water, these tanks are emptied. This makes the average density of the submarine less than the density of sea water, so the submarine rises up to the surface of water.
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