How do ships float?

Answer:

Haven’t we all been curious about why we sink in water while enormous ships float? What keeps the ship afloat is their shape and what’s inside them. Ships are hollowed-out shells of steel. Inside the ship, there is fuel, the ship’s engine, cargo and most importantly, there is air!

The air inside the ship is less dense than water. The average density of the total volume of the ship and everything inside of it (including the air) must be less than the same volume of water. As a ship sails in water, it pushes down and displaces an equal amount of water as its weight.

If the total density of the ship is almost equal to the density of the same volume of water, a greater amount of the ship will be on the water. If the average density of the ship is greater than the density of water, then the ship will sink beneath the surface of the water.