Physics
When hot-water is sprinkled on a hotter glass tumbler, it breaks because
Glass suddenly expands
Glass suddenly contracts
Water evaporates
Glass reacts chemically with water
Glass suddenly contracts
If the poured liquid is relatively hotter or colder in comparison to the tumbler, it will break. When hot water is poured into a tumbler there is an uneven increase in the thermal expansion of the walls of the vessel.
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