Standard Science Primary 5 Cycles

Ravi noticed water droplets forming on the outer surface of a cold glass of milk. Where did these water droplets come from?

A Water vapor in the air condensed on the cold surface.
B The milk evaporated and turned back to liquid.
C The milk leaked through the glass.
D The glass was wet before he poured the milk.
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Worked Solution

Step 1: The glass is colder than the surrounding air. Step 2: Air contains invisible water vapor. Step 3: When water vapor touches a cold surface, it loses heat. Step 4: The vapor turns into liquid water droplets (condensation).

Correct answer: Water vapor in the air condensed on the cold surface.

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