Equilibrium of Bodies in Liquids

It is a common experience that when an object is immersed in water, it becomes lighter whether it is wholly or partially immersed.

There is some upward force exerted by the liquid on an object when it is immersed in a fluid or liquid. This upward force experienced is called upthrust.

If the true weight of the object in air is W₁ and the apparent weight in liquid is W₂, then,

Upthrust, U = W₁ – W₂

Therefore the apparent weight when immersed in a liquid is;