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Statement -1 : When hot water is poured ...

Statement -`1` : When hot water is poured in a beaker of thick glass, the beaker cracks.
Statement - `2`: Glass is a bad conductor of heat and outer surface of the beaker does not expand.

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This is because glass is a bad conductor of heat. It does not allow the heat to pass quickly to the lower surface. As a result, different layers of the glass bottom attain different temperatures and expand differently. As a result, glass may break down at the bottom.
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