Archimedes principle - weight of the liquid displaced by the object= buoyant force
weight=mass x acceleration due to gravity
=volume x density x acceleration due to gravity
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Archimedes Principal is the principal for buoyancy
Archimedes is especially important for his discovery of the relation between the surface and volume of a sphere and its circumscribing cyclinder. He is known for his formulation of a hydrostatic principle (known as Archimedes' principle) and a device for raising water, still used in developing countries, known as the Archimedes screw.
Archimedes studied astronomy, engineering, mathematics, and war tactics.
"Eureka!" (I have found it!) - his shout after discovering of so called Archimedes' Principle.
Archimedes created the formula for measuring the circumference of a circle he used many-sided polygons, both inside and out to approximate it.