ppt on Archimedes’ Principle

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This was presented by my friend Falguni Sharma so the credit goes to her. I thank her for

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Archimedes ’ Principle Made by :- Falguni Sharma Class- IX

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Archimedes was asked to determine whether some silver had been substituted by the dishonest goldsmith. Archimedes had to solve the problem without damaging the crown, so he could not melt it down into a regularly shaped body in order to calculate its density. While taking a bath, he noticed that the level of the water in the tub rose as he got in, and realized that this effect could be used to determine the volume of the crown. For practical purposes water is incompressible, so the submerged crown would displace an amount of water equal to its own volume. By dividing the mass of the crown by the volume of water displaced, the density of the crown could be obtained. This density would be lower than that of gold if cheaper and less dense metals had been added. Archimedes then took to the streets naked, so excited by his discovery that he had forgotten to dress, crying “Eureka!" Discovery of Archimedes’ principle

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Buoyant force In physics, buoyancy is an upward force exerted by a liquid , gas or other fluid, that opposes the weight of an immersed object

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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. Archimedes’ principle

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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 .

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M=mass G=gravity W=weight W air =mg :– 1 W water =mg-u :-2 Subtracting eq 1 &2 W air -W water =mg-(mg-u)

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Use of Archimedes’ principle Its used in following :- Designing ships and submarines Lactometers , which are used in determining purity of milk Hydrometers used for determining density of liquids