Why does an ordinary glass tumbler crack when very hot tea or milk is poured in it?

Why does an ordinary glass tumbler crack when very hot tea or milk is poured in it?
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1 Answer

Answer :

Answer: When a hot liquid is poured into a tumbler, the inner layer of the tumbler gets heated, it expands before the outer layer and an unequal expansion of both layers causes the tumbler to crack.
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