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Droplets on Tiny Specks

Water vapour in the air cools down. It sticks to tiny dust and plant bits, then grows into clear round droplets.

In the picture

  1. A tiny dust speck: pale vapour dots gather around it.
  2. A small plant particle: pale vapour dots collect on its surface.
  3. A clear round droplet: liquid water has gathered into a ball around a speck.

Examples

  • Mist on a cold window
  • Clouds in the sky

Quiz: Droplets on Tiny Specks (Age 8)

  1. Why does water vapour collect on tiny dust and plant bits?

    • Because they give it a place to collect.
    • Because they make it warm.
    • Because they push it away.
  2. What does water vapour become when enough of it gathers?

    • Dust
    • A round liquid droplet
    • Dry air
  3. What does water vapour stick to in the air?

    • Birds and insects
    • Tiny dust and plant bits
    • Big rocks and soil

The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.

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Science, Age 8