Why do huge ships not sink?

A ship which has a large weight displace a large volume (thus large weight) of water. Hence the buoyancy force acting on the ship is much greater than the weight of the ship itself, making it to float on water. Thus ship do not sink in water.



Huge ships stay afloat due to the Principle of Buoyancy, famously known as Archimedes' Principle. Even though a cruise ship or cargo vessel may weigh over 200,000 tons, it is designed to be hollow, which creates a massive volume of air inside the hull. This makes the "average density" of the entire ship much lower than the density of the water it displaces. When a ship is placed in the ocean, it pushes aside (displaces) a volume of water. If the weight of that displaced water is equal to the weight of the ship, the water pushes back with an upward force called buoyancy that keeps the vessel on the surface. Engineers also ensure the Center of Gravity is kept low and the Center of Buoyancy is aligned to provide stability. As long as the hull remains intact and the total weight of the ship (including cargo and fuel) does not exceed the weight of the maximum volume of water it can displace, the ship will remain buoyant and will not sink.

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