What Is Archimedes Principle ?
Archimedes principle is a simple equation which defines the relationship between mass, pressure and volume. Archimedes principle is the best known law of physics, and it is used even today for simple computations.

This is the original Archimedes principle:
Any object, wholly or partially immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object.
Archimedes in this principle did not, however, consider any surface tension that would be caused when the object comes in contact with the liquid. The weight of the displaced liquid or fluid is directly proportional to the volume of the displaced fluid. This rule is applicable only if the surroundings are of uniform density. Typically, the liquid should have an equal consistency like water or oil for example. Also, this principle proves that a completely immersed object will have greater volume than the liquid. This is the actual formula that Archimedes gave the world.
For example, if the weight of a rock is measured at 10 Newtons, and if that rock is suspended into water using a string, and it displaces water equivalent to 3 Newtons. Then the force that is acting on the string would be the weight of the rock minus the weight of the water displaced, and that is 7 Newton in this case. So, buoyancy actually reduces the weight of the object that has been immersed into the water. Even objects that have sunk into the sea are reduced in weight apparently. This is the basic functionality of the Archimedes principle.
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