Standard Science Primary 5 Cycles

Siti poured cold water into a glass. After five minutes, she observed water droplets forming on the outer surface of the glass. Where did the water droplets come from?

A Water vapour in the surrounding air condensed.
B The cold water seeped through the glass.
C Air outside the glass evaporated.
D The ice inside the glass melted.
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Worked Solution

Step 1: Identify the states of matter: Water vapour is a gas in the air. Step 2: The outer surface of the glass is cooler than the surrounding air. Step 3: Warm water vapour in the air loses heat to the cold surface and condenses into liquid water droplets.

Correct answer: Water vapour in the surrounding air condensed.

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