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Riddle:

If boiling water is poured into a thick drinking glass as well as a very thin wine glass, of the two, which is more likely to crack?

Answer:

The thick glass is more likely to crack since glass is a poor conductor of heat. In a thin glass, the heat passes more quickly from the glass into the surrounding air, causing the glass to expand equally. When hot water is poured into a thick glass, the inner surface expands, but the outer surface does not. It is this extreme stress on the glass that causes it to crack.

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Boiling water Riddle Meme.
Boiling water Riddle Meme with riddle and answer page link.
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