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20 October 2014
Schools  >> All subjects for ages 4 - 11 years Science Clips
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Science topics ages 9 - 10
Gases around us

Curriculum relevance | Online lesson plan
Offline lesson plan | Worksheet |Activity

Online lesson plan


Know that gases are formed when liquids evaporate and that when a gas is cooled, it condenses to form a liquid

Understand that gases move and flow more easily than liquids, and in all directions

Understand that gases differ from solids and liquids in that they do not maintain their shape and volume, but spread out to fill the space they are in

National Curriculum

England: Key Stage 2, Science, Sc3 1e, 2b, 2d

Wales: Key Stage 2, Materials and their properties 1.5, 2.2, 2.6

Northern Ireland: Key Stage 2, Materials, Properties d; Change, c

Scotland: 5-14 Guidelines, Science, Materials from Earth, Level C; Changing materials, Level B

Resources required

Online activity from Science Clips website: Gases around us

Large labels of the words ‘liquid’, ‘gas’, ‘cool’, ‘heat’, ‘evaporate’, ‘condense’

Electric kettle of water

Teaching activities

Display the labels. What happens when you heat a liquid? Demonstrate by boiling water in the kettle. Ask children to explain what they see, using the displayed words.

Where does the gas go? Boil the kettle again, but this time near a cold window. Ask the children to first feel the window (it is cold). Tell the children to watch the cold window to see what happens when the steam touches it and cools down (it condenses and becomes a liquid again).

What shape does a gas have? How does it move? Write these questions on the board. Tell children that, as gases are often invisible, these questions are difficult to answer. Tell children they are going to work in the virtual laboratory to find out the answers. Open the online activity on the interactive whiteboard and explain to children how to use the Heat and Cool controls.

Arrange the children in pairs or groups, with a computer for each group. Ask children to work through the online activity, following the tasks written (and spoken) at the top of the screen.

Find answers to the questions on the board. What happened when the liquid was heated? Where did the gas go? What happened when you then removed the lids of the beakers? Where did the gas go then? Elicit ideas that gases spread out when they move and do not keep their volume, and that they take the shape of the whole container be it the room or the two beakers. When the lid was on the beakers, why did the liquid form in both beakers when it was cooled?


Ask children to click the Sorter button to sort things according to whether they are solids, liquids, or gases. They could also try the online quiz.

Suggested homework

Draw a cartoon strip of someone having a bath or shower. Can they explain scientifically what happens to the water?


Resources for teachers

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