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How can a submarine choose to sink or float?         If a boat in a...

How can a submarine choose to sink or float?

        If a boat in a canal lock sank, would the water level in the lock rise or fall?

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Answer #1

Ballast tanks filled with compressed air is used in a submarine. When needed the air filled in the tank is released and takes on water which increases the density and causing it to sink. When water in the tank is pushed out, submarine’s density decreased and causing it to float.

The water level will fall because the iron boat displaces more water when supported than when submerged. All floating matters displace a quantity of water with weight equal to their own weight; if the thing has a density greater than that of water then the volume of water displaced must be greater than the volume of the object. However, when submerged, the object will only displace an amount of water equal to its own amount.

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