Question

Why does a thick glass tumbler crack when boiling water is poured on it?

Answer 1

Answer:

when you pour a very hot liquid into a thick tumbler what happens is, the surface of glass that comes in contact with the hot liquid heats up and expands as per its coefficient of thermal expansion, while the outer layer still remain cold and does not expands hence it cracks

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Answer 2

Answer:

Explanation:

This is because the inside of the glass expands suddenly but the outside does not, as glass does not conduct heat easily. If a steel spoon is placed inside the tumbler, it absorbs the heat when hot water is poured into it and prevents the glass from cracking.