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Mechanical Properties of Fluids
Question
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Why does a metal spoon placed in a glass allow hot water to be poured in without breaking the glass?

Answer

When hot water is added in the glass, it breaks due to unequal expansion. This can be avoided by lowering the temperature of liquid.
Spoon made of metal is a good conductor of heat. Therefore, when hot water is poured into glass, the spoon takes up some heat and the temperature of liquid drops. 

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