Question

athe glass tumbler often cracks when boiling water is poured into it why?

Answer 1

glass tumbler often cracks when boiling water is poured into it because the inner surface is not much cold but the outer surface is very cold and when boiling water comes with contact with cold glass tumbler it cracks
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Answer 2

Simple,

When hot water is poured inside the glass tumbler,the atoms and molecules inside the tumbler expand as there is rise in temperature...Due to this expanding,the glass tumbler breaks.

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