The force which makes heavy objects appears lighter when immersed in a liquid.
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Solution
Buoyant force - When an object is submerged in a fluid (liquid or gas), the pressure difference acting on the top and bottom surfaces produce an upward force equal to the weight of the fluid displaced by the object. This is known as buoyant force.
This force is what makes heavy objects feel lighter in water.
Hence, buoyant force makes heavy objects appear lighter when immersed in a liquid.