How can ships made of steel float on water?

Principle

Everyone has at one time or another wondered how comes that ships made of steel can float on water but a steel ball simply sinks. Expanded bodies have the property of having less weight in water than in air, as one notices when one swims, for example. In this experiment, buoyancy and hydrostatic pressure are dealt with using Archimedes' principle to find out what determines whether a body will sink or swim.

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