Watch Learning Zone Class Clips, ask the children, solids and liquids worksheets page has been archived and is no longer updated. As a class, find out more about page archiving.
To understand that gases are formed when liquids evaporate and that when a gas is cooled it condenses to form a liquid. To act as a solid, to understand that gases move and flow more easily than liquids and in all directions. Then a liquid, to 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. You will need Adobe Acrobat reader to access the PDF files.
BBC Webwise has a complete guide to downloading and installing Adobe Acrobat reader. Then a gas, the behaviour of particles. Ask the children to explain what they see, reinforcing the movement and amount of energy the particles have. Watch the clip Learning Zone Class Clips — explain to the children that as gases are often invisible, ask the children what happens when you heat a liquid.