Lesson eLearning

A cold glass of water has water droplets on its outside. Explain how these droplets form.

medium 3 marks Class 3 · EVS · Water O Water
Answer
Water vapour condenses onto the cold surface of the glass, forming droplets.

The correct answer is Water vapour condenses onto the cold surface of the glass, forming droplets. — Thus droplets appear on the cold glass surface.

Step-by-step solution

  1. The room air contains water vapour.
  2. The glass surface is cooler than the surrounding air.
  3. When the vapour touches the cold glass it cools down.
  4. Cooling reduces the vapour’s ability to stay in gas form.
  5. The vapour changes into liquid water – condensation.
  6. The liquid forms small droplets on the glass.
  7. Thus droplets appear on the cold glass surface.
Common mistake: Assuming the glass is wet with water from inside

Concept tested: Condensation

Published · How this solution was prepared and checked

← All Water O Water questions