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A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle. Explain why ?

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A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle. Explain why ?

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When hot water is poured over the neck of the bottle, it expands. As a result the stopper gets loosened and can be removed easily.

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