What is Buoyant Force?

The buoyant force is the upward force exerted on an object wholly or partly immersed in a fluid. This upward force is also called Upthrust. Due to the force, a body submerged partially or fully in a fluid appears to lose its weight, i.e. appears to be lighter.

Factors that Affect Buoyant Force:

  • The density of the fluid.
  • The volume of the fluid displaced.
  • The local acceleration is due to gravity.

An object whose density is greater than that of the fluid in which it is submerged tends to sink. In terms of relative density, if the relative density is less than one, it floats in water, and substances with a relative density greater than one sink in water.


Center of Buoyancy

The point where the force of Buoyancy is applied or the point on the object where the force acts are termed as the Center of Buoyancy. It should be illustrated that the force of buoyancy is vertical, and thus, the Center of Buoyancy is the point situated on the center of the gravity of the liquid that is being displaced by the object submerged.

Buoyancy is the force that causes objects to float. It is the force exerted on an object that is partly or wholly immersed in a fluid. Buoyancy is caused by the differences in pressure acting on opposite sides of an object immersed in a static fluid. It is also known as the buoyant force. Buoyancy is the phenomenon due to Buoyant Force.

Applications of Buoyancy

  • Hot Air Balloon: The atmosphere is filled with air that exerts a force on any object. A hot air balloon rises and floats due to the buoyant force. It descends when the balloon’s weight is higher than the buoyant force. It becomes stationary when the weight equals the buoyant force.
  • Ship: A ship is constructed in a way so that the shape is hollow, to make the overall density of the chip lesser than the seawater. Therefore, the force acting on the ship is large enough to support its weight.

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