Advanced Science Primary 4 Energy

Ravi found it difficult to open a glass jar with a tight metal lid. He should __________.

A place the lid in hot water
B place the jar in hot water
C place the lid in ice water
D place the whole jar in the freezer
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Worked Solution

Step 1: Metals expand when they gain heat. Step 2: Placing the lid in hot water causes the metal lid to expand. Step 3: Expansion makes the lid slightly larger and easier to unscrew.

Correct answer: place the lid in hot water

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