Standard Science Primary 5 Cycles

Jun Jie poured cold milk into a glass. Ten minutes later, he noticed water droplets on the OUTSIDE of the glass. How did these water droplets form?

A The cold glass melted into water.
B Air outside the glass evaporated.
C The cold milk seeped through the glass.
D Water vapour in the surrounding air lost heat and condensed.
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Worked Solution

Step 1: Identify the source of the water: the air contains invisible water vapour. Step 2: The outside surface of the glass is cold due to the cold milk inside. Step 3: Warm water vapour from the air touches the cold surface, loses heat, and condenses into liquid water droplets.

Correct answer: Water vapour in the surrounding air lost heat and condensed.

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