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Getting salt back from seawater
Age 11 · Chemistry
When salty water evaporates, the water turns into invisible vapour and goes into the air, but the salt stays behind as white crystals. A wide, shallow layer of water, warm sunshine and wind all make the water evaporate faster.
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Age 11: open this week
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In the picture
- Shallow, wide basin: a large water surface evaporates quickly
- The sun: warmth gives the water energy to evaporate
- Grass bent by the wind: moving air carries the water vapour away
- Salt crystals: the dissolved solid left behind once the water has gone
Examples
- A puddle on a sunny, windy day dries up much faster than on a cold, still day.
- After seawater dries on your skin at the beach, you can see tiny white salt grains.
Key takeaways
- Evaporation removes the water and leaves the dissolved solid behind.
- A large surface area, warmth and wind make evaporation faster.
Quiz: Getting salt back from seawater (Age 11)
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When salty water evaporates completely, what happens to the salt?
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You pour the same amount of seawater into three containers. Which one will dry out fastest?
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Why does wind help water evaporate faster?
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