Standard Science Primary 4 Matter

Why do water droplets form on the cold surface of a glass of ice-cold water?

A Water vapour in the air gained heat and melted.
B Ice cubes melted and turned into gas.
C Water from the glass seeped through the walls.
D Water vapour in the air lost heat and condensed.
Show Worked Solution

Worked Solution

Step 1: Surrounding air contains invisible water vapour. Step [2-9]: When the warm water vapour touches the cold outer surface of the glass, it loses heat. Step [2-9]: This loss of heat causes the gas to turn into liquid water droplets (condensation).

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

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