Standard Science Primary 5 Cycles

Jun Jie poured cold water into a glass. After a few minutes, he saw water droplets forming on the outer surface of the glass. Where did these droplets come from?

A The cold water evaporating and then condensing.
B Water leaking through the glass.
C The glass melting slightly.
D Water vapour in the air losing heat to the cold glass.
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Worked Solution

Step 1: The surface of the glass is cold because of the cold water inside. Step 2: Water vapour (gas) is present in the surrounding air. Step 3: When water vapour touches the cold surface, it loses heat and changes into liquid water droplets (condensation).

Correct answer: Water vapour in the air losing heat to the cold glass.

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