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

Why does a thick glass tumbler crack when boiling hot water is poured into it?
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Matter expands when it is heated. When you pour boiling waterinto a glass the bottom becomes heated and expands while the restof the glass is at a different temperature. As the bottom of theglass expands it literally expands and causes stress in the glassthat is eventually enough to fracture the bond between the glassmolecules, causing a crack. If you heat the glass more evenly itwill expand evenly, preventing that stress from happening. Slow andeven temperature changes will prevent the breaking.
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