Standard Science Primary 4 Energy

Stan has a tight metal lid on a glass jar. Which method will help him open the lid easily?

A Place the lid under cold running water
B Place only the lid in hot water
C Place the jar in hot water
D Put the jar in the freezer
Show Worked Solution

Worked Solution

Step 1: The lid needs to become slightly larger than the jar opening. Step [2-9]: Heating the metal lid causes it to expand. Step [2-9]: Placing only the lid in hot water ensures it expands while the jar stays the same size.

Correct answer: Place only the lid in hot water

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