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Submarines have variable density.

When a submarine is in port, its overall density is less than that of water so some of it is above the surface of the water. They're made out of steel, which is more dense than water, but they're hollow; most of the volume of a submarine is air.

To make a submarine able to dive, they pump water into tanks. By adjusting the amount of water, they can make the density equal to water's density, which allows the boat to stay at a certain depth without expending energy to hold it up.

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12y ago

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