A metal sphere is suspended from one pan of a sensitive balance and is immersed completely in water. The other pan carries weights to balance the immersed sphere. The water is then heated to a high temperature. The water expandes, the sphere sinks in water. To balance the sphere, the weights are to be added or removed from the other pan , explain.

Explanation

When a body is completely immersed in water and the water is heated, the density of water decreases faster then that of solid because cubical expansion of water is more then that of a metal sphere. Due to it, the upward thrust on body becomes less and the apparent weight of body increases. Therefore,, weights have to be added in the other pan to balance the sphere,