Crack is developed in glass when hot water is poured in it. Give reason.
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Answer:
When boiling water is poured into a thick tumbler its inner surface expands. However, due to low thermal conductivity of glass, the expansion of outer surface of the tumbler is quite small. Due to uneven expansion of the outer and inner surfaces, the tumbler breaks
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Answer:
It is due to the pressure exerted by the water vapours on it
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