lesson
Gas can become droplets
1 · Learn
Condensation changes a gas into a liquid. Water vapour in air can condense on a cool surface, forming visible liquid droplets.
Drops on the outside of a cold sealed cup can come from the surrounding air, not through a leak in the cup. The white mist near cooling steam contains tiny liquid droplets; water vapour itself is invisible.
2 · Worked example
I see drops on the outside of a cold closed container. I consider condensation from the air rather than assuming all drops came from inside.
3 · Your turn
What state change forms liquid droplets from water vapour? Are the visible droplets themselves gas?
Check your answer
Condensation. No: the visible droplets are liquid water.
4 · Apply your learning
Observe a cold sealed container with adult help. Record where droplets appear and discuss the explanation.
Adult guidance and safety
Use safe cold water only, no hot steam or boiling-water demonstrations by children. Wipe spills promptly.
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