There are ballast tanks in a submarine. It is full of compressed air, and thus it floats. When the submarine wants to sink, the air is replaced by seawater. The weight of the submarine is now becoming greater than the weight of the amount of water it displaces. If it wants to stay at a constant depth, then the seawater/compressed air is balanced at a constant level. When it wants to rise to the surface again, the seawater is let out and the ballast tanks is once more full of compressed air.
http://wiki.answers.com/Q/How_does_a_submarine_sink_and_floatThus, when seawater enters the ballast tanks, the density of the submarine will be denser than water and when seawater in the tanks is replaced by air, the density of the submarine will be less dense than the seawater in its surroundings and hence, it will float.
http://wiki.answers.com/Q/How_does_a_submarine_sink_and_floatThus, when seawater enters the ballast tanks, the density of the submarine will be denser than water and when seawater in the tanks is replaced by air, the density of the submarine will be less dense than the seawater in its surroundings and hence, it will float.
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