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Transcript

WHY EVAPORATION IS USEFUL

Stage 5

We use evaporation in many different ways. Talk about how evaporation happens in each of the pictures and how it is useful.

Theory

drying your hair

using a tumble dryer

grapes drying on a rack in the sun

Evaporation Cools Things Down

Liquids evaporate faster when the air is moving.

When we are hot, we sweat. As the fastest, hottest water particles in the sweat escape by evaporation, they take heat energy from our skin.

Some more cases

When we sweat, our skin cools down.

Water needs energy to evaporate and change from a liquid to a gas. If this energy comes from the surface of your skin, your skin gets cooled.

Have ever used hand sanitiser? The sanitiser evaporates off your hands making them feel cool.

Sweating makes us cool.

Get Cool Faster

  • Breathe onto the back of your hand. Does your breath feel warm or cool?

  • Blow onto the back of your hand. Does it feel warmer or cooler than your breath?

  • Now lick the back of your hand and then blow on it. Blow gently at first and them harder. What do you feel?

  • Suggest a reason for

your observation.

Activity

1

Questions

(homework)

1. Explain two ways in which air dryer makes water evaporate from our hair.

2.

a) Think of three foods that are made by using evaporation.

b) Find more about how one of these foods is made.

3. Why do you think soil in the garden dries out more quickly on hot,windy days?

What you have learnt

Extra point!

Why is it better to stay fully clothed in a hot desert, even if you feel very hot?

Conclusions

  • Evaporation helps us to dry things such as washing, our hair and food.

  • Liquids evaporate faster when the air is moving.
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