Second Class science · D.19 · Earth materials
Weather and water
Clouds form when invisible water vapor in the air cools down and turns into tiny liquid drops. This process does not require cold air or sunlight directly.
See worked examples
Omar wonders: Why does a cloud form on a cold day?
- Water vapour cools and turns to tiny droplets (right)
- Warm air makes clouds grow fast
- Rain falls from the sky first
Zoe and Omar are curious. What happens to water vapor when it cools in the sky?
- It disappears
- It becomes gas again
- It turns into tiny liquid droplets (right)
Kai and Felix are curious. What causes water droplets to form in the sky?
- Wind carries them
- Water vapour cools (right)
- Air moves fast
Tip: Clouds form when invisible water vapor in the air cools down and turns into tiny liquid drops. This process does not require cold air or sunlight directly.
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