Year 3 Geography 11.1.21

Geography Lesson 1 (week beg 11-1-2021)

L.O. Understand the meaning of evaporation and condensation.

You are going to do 2 investigations showing the changes of state to introduce the water cycle.

Investigation 1

You will need A glass or the bottom half of a plastic bottle

Cold water

Investigation 1 Pour some water into a glass or the bottom half of a clear plastic bottle cut in half.

Investigation 1

Mark the level of the water on the outside.

Investigation 1

Leave in a window or other warm place.

Investigation 1

Check after 2/3 hours.

Investigation 1

Has the water level gone down?

Investigation 1

As water heats up, it changes from a liquid to a gas.

This is called evaporation.

Some of the water (liquid) has changed into water vapour (gas) and gone into the air.

Investigation 1

EVAPORATION When a material changes from a liquid into a gas.

Investigation 2

Fill a glass with water from a cold tap.

If you can, add some ice.

Investigation 2

Leave it for a couple of minutes.

Feel the sides.

Investigation 2

Leave it for a couple of minutes.

Feel the sides.

After a while, you should be able to feel (and often see) a thin layer of water on the outside.

Investigation 2

This is condensation. Some of the water vapour from the air in the room has touched the side of the glass, cooled down and changed from water vapour (gas) into water (liquid).

Investigation 2

CONDENSATION

When a material changes from a gas into a liquid.

Let’s watch a video clip, showing how this occurs in the water cycle.

Click on the link below What is the Water Cycle on BBC Bitesize What is the water cycle? - BBC Bitesize Watch the clip and complete the activities.