Page 43 - York Global Science 6 - Physical Science

Physical Science

Think!
What happens to the liquid? Can you get the liquid back?

When a liquid evaporates, the molecules become more spread out and
change into a gas. When the gas loses energy and cools down, it condenses

back into a liquid. You can collect the liquid that condenses.

cool

water vapour

salt solution

water

Can you explain the different processes that are happening in this diagram?

How can evaporation and condensation help to separate a salt solution?
Where can you see condensation in daily life?

Let’s Explore

Watch the demonstration on how to separate a salt solution back into a
liquid and a solid. Explain what happens and why. Use the worksheet in the
Workbook to draw and add labels to a diagram to explain what happens.

Let’s Reflect

1 When is evaporation useful?

2 When is condensation useful?

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