Why does a ship float?

Answer

Because its outwardly-curved sides pushes aside a great deal of water to float the ship and its load.
2 Additional Answers
Most ships were made of wood and wood floats on water and those that are made of heavy steel will float as long as it weighs less that the density of the water it displaces. Steel ships are capable of floating due to the fact that they have air that displaces the density of water. Air lowers the weight of the ship since it does not weigh as much as the water.
The basic reason behind the floating of ships is the Archimedes Principle of buoyancy. Applying this principle to ships, we notice that a ship will float when the weight of the water it displaces equals the weight of the ship. This has led to the shaping of a ship in such a way as to displace its own weight of water before it reaches the point where it will submerge.
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