Advanced Science Primary 4 Cycles

Mei noticed water droplets forming on the *outside* of a glass of cold water. Which of the following statements about this observation is correct?

A Water vapour in the surrounding air lost heat to the cold surface of the glass.
B The cold water gained heat and condensed.
C The glass absorbed moisture from the air.
D The cold water seeped through the glass.
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Worked Solution

Step 1: Air contains invisible water vapour. Step 2: The glass surface is colder than the air. Step 3: When warm vapour touches the cold glass, it loses heat and changes into liquid water (condensation).

Correct answer: Water vapour in the surrounding air lost heat to the cold surface of the glass.

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