Standard Science Primary 4 Energy

What happens to the temperature of water while it is boiling?

A It remains constant at 100°C.
B It continues to increase.
C It decreases slightly.
D It fluctuates between 90°C and 110°C.
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Worked Solution

Step 1: Boiling is a change of state (liquid to gas). Step [2-9]: Pure substances have a fixed boiling point where temperature stays constant until all liquid has changed state.

Correct answer: It remains constant at 100°C.

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