The reason for the metal lids on glass jars to be loosened by running hot water over them is because of thermal expansion of metal lid and the thermal expansion coefficient of glass is lesser than thermal expansion coefficient of metal.

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Chapter 16, Problem 10CQ

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The reason for the metal lids on glass jars to be loosened by running hot water over them is because of thermal expansion of metal lid and the thermal expansion coefficient of glass is lesser than thermal expansion coefficient of metal.

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