Answers to the science quiz are reviewed! Have you done them yet?
1. If a ship was made in solid iron, it would sink. But in real ships, the metal is being
spread out with lots of air. There are cabins and cargo hold the engine rooms.
So most of the volume of the ships is made up of air. The result is that the density
of the whole ship - metal and air together -is less than the density of water. So the
ship floats. The size of the ship is called displacement, Measured in tonnes. That
the mass of the water displaced by the ship and also the mass of the ship.The ship
is designed in a shape that displaces enough water to let it float.

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