Standard Science Primary 4 Energy

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

A wrap the lid in a cold towel
B put the lid in ice
C put the jar in cold water
D put the lid in hot water
Show Worked Solution

Worked Solution

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

Correct answer: put the lid in hot water

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