Standard Science Primary 5 Cycles

Mei poured hot tea into a cup and placed a glass lid over it. After a few minutes, she noticed tiny water droplets on the underside of the lid. Where did the water droplets come from?

A The tea splashed onto the lid.
B The glass lid melted slightly.
C Water vapour from the hot tea condensed on the cooler lid.
D Ice inside the cup evaporated.
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Worked Solution

Step 1: The hot tea evaporates, turning into warm water vapour. Step 2: The water vapour rises and comes into contact with the cooler surface of the glass lid. Step 3: The vapour loses heat to the lid and condenses into liquid water droplets.

Correct answer: Water vapour from the hot tea condensed on the cooler lid.

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