A cold glass of water has water droplets on its outside. Explain how these droplets form.
Answer
They form when water vapor in air cools and changes into liquid droplets on the glass surface.
The correct answer is They form when water vapor in air cools and changes into liquid droplets on the glass surface. — Conclude that the vapour condenses into tiny liquid droplets on the glass.
Step-by-step solution
- Identify that the glass is cold relative to the surrounding air.
- Realise that warm air near the cold surface contains water vapor.
- Know that cooling reduces the vapour's capacity to stay in gas form.
- Conclude that the vapour condenses into tiny liquid droplets on the glass.
Common mistake: Thinking droplets fall from the glass instead of forming from the air.
Concept tested: Condensation
Published · How this solution was prepared and checked
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