HOW SUBMARINES FLOAT
BY:KASHISH, GURKIRAT AND HARVEY
Submarines have ballast tanks that can hold air and water. When a submarine floats the ballast tanks fill up with air. This causes the density of the submarine to be less than the surrounding water. In return the water pushes the submarine toward the surface, defying gravity in the process. This is called positive buoyancy.
The submarine stays leveled when the ballast tanks are filled with air and water to make the density of the submarine equal to the surrounding water. Which then makes the power of water's upward force (buoyancy) equal to the force gravity is acting on the submarine. This is known as neutral buoyancy.
A submarine sinks when the ballast tanks fill up with water. This will cause the density of the submarine to be higher than the water. The difference in density will cause the buoyancy to be less than the force of gravity, that makes the submarine sink. The name of this force is negative buoyancy.