In physics, buoyancy is the upward force on an object produced by the surrounding liquid or gas in which it is fully or
partially immersed, due to the pressure difference of the fluid between the top and bottom of the object. The net upward
buoyancy force is equal to the magnitude of the weight of fluid displaced by the body. This force enables the object to float or
at least seem lighter. Buoyancy is important for many vehicles such as boats, ships, balloons, and airships, and plays a
role in diverse natural phenomena such as sedimentation.

Archimedes' principle
It is named after Archimedes of Syracuse, who first discovered this law. According to Archimedes' principle, "Any object,
wholly or partly immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object."

Source: WikipediA
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