HOTS Science Primary 4 Energy

Jun Jie poured boiling water into a thick glass tumbler. The glass cracked immediately. What is the most likely reason?

A The water was too heavy for the glass.
B The outside of the glass expanded faster than the inside.
C The inside of the glass expanded faster than the outside.
D The glass contracted due to the heat.
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Worked Solution

Step 1: Glass is a poor conductor of heat. Step [2-9]: The inner surface expands immediately upon touching boiling water. Step [2-9]: Because it is thick and a poor conductor, the heat does not reach the outer surface fast enough. This uneven expansion causes the crack.

Correct answer: The inside of the glass expanded faster than the outside.

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