ARCHIMEDE’S PRINCIPLE AND ITS APPLICATIONS

8/3/2019 ARCHIMEDES PRINCIPLE AND ITS APPLICATIONS

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EFFORTS BY: Anmol JainHansraj Model School

Class: XI-ASession-2010-11


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This presentation is made with the help of my

physics teacherMrs. Binduandmy parents.

Im verygreatfull to them as they helped me and

made me understand the concept.


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Main reason behind thispresentation is betterunderstanding of Archimedesprinciple

And I hope that Im successful inmy work.


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Archimedes was a greek scientist. Hediscovered the principle, subsequently

named after him, after noticing that thewater in a bathtub overflowed when he

stepped into it. He ran through thestreets shouting Eureka!, which means

I have got it. This knowledge helpedhim to determine the purity of the goldin the crown made for the king.

His work in the field of geometry and


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When a body isimmersed fully or

partially in afluid, it

experiences an

upward force thatis equal to the

weight of the fluiddisplaced by it.


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The principle applies to both floating and submerged bodies and to all fluids, i.e., liquids and gases.It explains not only the buoyancy of ships and other vessels in water but also the rise of aballoon in the air and apparent loss of weight of objects underwater. In determining whether a

given body will float in a given fluid, both weight and volume must be considered; that is, therelative density, or weight per unit volume, of the body compared to the fluid determines thebuoyant force. If the body is less dense than fluid, it will float or, in the case of a balloon, it

will rise. If the body is denser than the fluid, it will sink. Relative density also determines theproportion of a floating body that will be submerged in a fluid. If the body is two thirds asdense as the fluid, then two thirds of its volume will be submerged, displacing in the process avolume of fluid whose weight is equal to the entire weight of the body. In the case of asubmerged body, the apparent weight of the body is equal to its weight in air less the weight ofan equal volume of fluid. The fluid most often encountered in applications of Archimedes

principle is water, and the specific gravity of a substance is a convenient measure of its relativedensity compared to water. In calculating the buoyant force on a body, however, one must alsotake into account the shape and position of the body. A steel rowboat placed on end into thewater will sink because the density of steel is much greater than that of water. However, in itsnormal, keel-down position, the effective volume of the boat includes all the air inside it, so thatits average density is then less than that of water and as result it will float.


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ARCHIMEDE’S PRINCIPLE AND ITS APPLICATIONS