Why does an ordinary glass tumbler crack of very hot water is poured into it
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Explanation:
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:
The crack is caused by differential thermal expansion. The part of theglass that the boiling water touches first expands due to the heat, but theheat doesn't conduct through the glass quickly so there is stress between the expanded inside of the glass and unexpanded outside of the glass.
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