Standard Science Primary 4 Energy

Ravi observed that the metal lid of a glass jar was too tight to open. He ran hot water over the metal lid for a minute and was then able to open it easily. Why?

A The metal lid expanded.
B The glass jar contracted.
C The hot water acted as a lubricant.
D The metal lid became smaller.
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Worked Solution

Step 1: Metal expands when heated. Step 2: Heating the lid caused it to become slightly larger. Step 3: This loosened the grip on the jar.

Correct answer: The metal lid expanded.

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