Answer:
Tie a small stone with the hook of spring balance as
shown in figure (a). The spring of the balance stretches due to the weight of
the stone. The pointer attached with the spring shows the weight of the stone
in the air. Let this weight be 
Now dip the stone
in the water as shown in figure (b). "We find that the extension of the
string decreases and the pointer attached to the spring shows the weight of the
stone as 
. This weight 
of
the stone in water is less than the weight 
of
the stone in air.
Thus, we conclude that a body (say a stone) loses its
weight immersed in a liquid.
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