Archimedes Principle


 
 
Concept Explanation
 

Archemidies Principle

Archimede's Principle: This principle states that when a solid body is wholly or partially immersed in a fluid (liquid or gas) it experiences an upward thrust or buoyant force equal to the weight of the fluid displaced by the body. This aiso known as the principle of buoyancy. It is due to up thrust that objects apparently weigh less when immersed in fluid.

The Archmedes principle is relevant, for example, in understanding why a nail of iron sinks in water whilee a large ship made also of iron floats, as does a piece of cork. (For a body to float in a liquid, the weight of liquid displaced by it must be cqual the weight of the body. This is the law of tloatation.)

 If an ocean-going vessel sails up a river, it sinks deeper in the river than it does in the sea. The reason is that seawater, because of the salts dissolved in it, is denser than fresh water.

A submarine is so built that its total weight is a líttle less than the weight of the same volume of seawater. It has tanks into which seawater is allowed to enter when the craft is about to submerge. With the added weight of the seawater in its tanks, the submarine weighs more than an equal volume of seawater, and sinks. When it is to rise to the surface, the water is forced out of the tanks by means of compressed air. 216

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