1.

How can you measure the force of buoyancy and how much? (OR) Why does and stone lose weight when it is immersed in water?

Answer»
  • Suspend a stone from a spring balance. 
  • Note that the reading of the spring balance. 
  • The reading gives the weight of the stone. 
  • Take a beaker half filled with water. 
  • Now immerse the stone in the water. 
  • Note the reading of the spring balance. 
  • The reading gives the weight of the immersed stone. 
  • We may notice that the stone, when immersed, appears to lose some weight. 
  • The immersed stone appears to lose weight because the force of BUOYANCY, exerted on the stone by the water in the upward direction. 
  • Thus the apparent loss of weight must be equal to the force of buoyancy acting on the immersed stone. 
  • The lose of weight of stone is equal to weight of the water displaced by the stone, this is the force of buoyancy.


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