Application of a Submarine

Application Of a Ship(Submarine).


Whether a submarine is floating or submerging depends on the ship's buoyancy. Buoyancy is controlled by the ballast tanks, which are found between the submarine's inner and outer hulls.




A submarine resting on the surface has positive buoyancy, which means it is less dense than the water around it and will float. At this time, the ballast tanks are mainly full of air.


To submerge, the submarine must have negative buoyancy. Vents on top of the ballast tanks are opened. Seawater coming in through the flood ports forces air out the vents, and the submarine begins to sink.


The submarine ballast tanks now filled with seawater is denser than the surrounding water. The exact depth can be controlled by adjusting the water to air ratio in the ballast tanks. Submerged, the submarine can obtain neutral buoyancy. That means the weight of the submarine equals the amount of water it displaces. The submarine will neither rise nor sink in this state.


To make the submarine rise again, compressed air is simply blown into the tanks forcing the seawater out. The submarine gains positive buoyancy, becomes less dense than the water and rises.

1. Shahirah: I understand the application of the Submarine that the upward force of  the ship is greater than the downward force when the submarine rises.
2. Nurin: I understand the pressure at the bottom of the submarine is greater than at the top will make the submarine rises.
3. Fatimah: The uses of the ballast tanks are to allow the vessel to submerge, water being taken in to alter the vessel's buoyancy and allow the submarine to dive.
4. Iffah: Ballast tank help us to understand the application of submarines better.

In Conclusion, the application of submarine is another example of the Archimedes Principle.Hence,Archimedes Principle is really helpful to mankind.