PHYSICS.
A branch of Logical Sciences.
The History of the Archimedes' Principle.
Archimedes' principle is a law of physics stating that the upward buoyant force exerted on a body immersed in a fluid is equal to the weight of the fluid the body displaces. In other words, an immersed object is buoyed up by a force equal to the weight of the fluid it actually displaces. Archimedes' principle is an important and underlying concept in the field of fluid mechanics. This principle is named after its discoverer, Archimedes of Syracuse.
The Archimedes' Principle
An object immersed in a liquid experiences an upward force, called upthrust or buoyancy. This has been generally recognised for a long time. It was the Greek mathematician and philosopher Archimedes (287-212 BC) who first put it into a general principle. His statement, now known as Archimedes' principle, was that "when an object is immersed in a liquid the upthrust is equal to the weight of liquid displaced by the object". Thus, a rubber duck floats because its mass is equalled by the water it displaces before it physically goes under the surface. A solid lump of iron on the other hand will sink, because the water cannot displace the mass of the iron before the iron sinks.