Question

Explain the following: A hollow glass sphere which floats with it’s entire volume submerged in water at 4°C, sinks when water is heated above 4°C.

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Answer

As we know that, the density of water decreases on heating water above 4°C. Hence, the upthrust acting on the glass sphere decreases and becomes less than the weight of the glass sphere, hence the glass sphere sinks.

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