1. The problem statement, all variables and given/known data So I'm teaching a year 8 (12 year olds) class on air or the properties of air. Does anyone have any ideas of what I should tell them or how to explain these properties in a understandable way? 2. Relevant equations In the document that I have been given it says that I must teach these following things: Explain that air is a real substance that occupies space Recall that a body of air has measurable weight. Recall that air exerts considerable pressure on the surface of all things in it. 3. The attempt at a solution I will be doing a series of experiements to show these things, eg. turning a beaker upside down and push into water, weighing an almost fully inflated basketball then weighing it again after it is fully inflated, a glass filled with water place cardboard over the top and turn it upside down. They will answer some questions on these experiements and try come up with some general rules explaining what has happened. Then I will go through what they should have seen and why what they saw occured. I have attached the powerpoint notes that I would like to use but I feel like there should be more I'm telling them but I don't know what. All help appreciated!!!