Siti found it difficult to open a glass jar with a metal lid. She poured hot water over the metal lid for a minute and was then able to open it easily. Why?
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Worked Solution
Step 1: Metal is a better conductor of heat than glass.
Step 2: The metal lid gains heat and expands faster/more than the glass.
Step 3: This loosens the grip of the lid on the jar.
Correct answer: The metal lid expanded more than the glass jar.
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