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Take a piece of stone and tie it to one end of a rubber string or a spring balance. Suspend the stone by holding the balance or the string as shown in the figure (a).

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Take a piece of stone and tie it to one end of a rubber string or a spring balance.

Suspend the stone by holding the balance or the string as shown in the figure (a).

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  • Note the elongation of the string or the reading on the spring balance due to the weight of the stone.
  • Now, slowly dip the stone in the water in a container as shown in Fig. (b).
  • Observe what happens to the elongation of the string or the reading on the balance.

Observations :

  • In Fig. (a) the elongation of the string is 6 cm.
  • In Fig. (b) when the stone is dipped in water the length of string reduced to 5 cm.
  • The length of the string in case (b) decreases due to the upward force exerted by water on the stone called as buoyant force.
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