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by jitender yadav, Feb 6, 2018, 4:00:36 AM | 2 minutes |

Why we feel objects lighter when submerged in water, What is Archimedes' Principle??

Do you ever think why an object feels lighter when submerged in water??

The answer is here:-

                when we put any object in water it displaces water and displaced water volume  is equal to volume of body submerged in water.

The water buoys it up, pushes upward, partially supporting it somehow. This phenomenon is explained by Archimedes which we called 

 Archimedes' Principle.

Archimedes quantified the phenomenon. His Buoyancy Principle asserts that an object immersed in a fluid will be lighter (that is, it will be buoyed up) by an amount equal to the weight of the fluid it displaces. The upward force exerted by the fluid is known as the buoyant force. A 10-N body that displaces 2 N of water will "weigh" only 8 N while submerged.

Buoyant force is caused by gravity acting on the fluid. It has its origin in the pressure difference occurring between the top and bottom of the immersed object, a difference that always exists when pressure varies with depth (as it does for a fluid).


When a solid object is wholly or partly immersed in a fluid, the fluid molecules are continually striking the submerged surface of the object. The forces due to these impacts can be combined into a single force the buoyant force.


Comments (1)

  • user image
    Anurag Srivastava
    Feb 7, 2018, 6:08:41 PM

    Nice article Jeetu. It will help the physics students. :)

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