A cube of side 5 cm is immersed in water and then in saturated salt solution. In which case will it experience a greater buoyant force. If each side of the cube is reduced to 4 cm and then immersed in water, what will be the effect on the buoyant force experienced by the cube as compared to the first case for water. Give reason for each case.


Buoyant force, F = Vpg

  • p = Density of water
  • V = volume of water displaced by the body
  • g = The gravity

The volume and density of an object decide its Buoyancy. Cube will experience a greater buoyancy in a saturated solution. If the cube is reduced to 4 cm on each side, the volume of the cube becomes less as the buoyancy will be reduced as buoyant force is directly proportional to volume.

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