Standard Science Primary 4 Energy

Siti heated a beaker of water until it started boiling. She continued heating it for another 5 minutes. What would happen to the temperature of the water during those 5 minutes?

A The temperature will continue to rise.
B The temperature will remain at 100°C.
C The temperature will fluctuate.
D The temperature will decrease slowly.
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Worked Solution

Step 1: Pure water boils at 100°C at sea level. Step [2-9]: During boiling, heat gain is used to change the state from liquid to gas rather than increasing temperature. Step [2-9]: Thus, the temperature stays constant at the boiling point.

Correct answer: The temperature will remain at 100°C.

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