Today we looked at how air moves with an air cannon. Using a bin (clean) with a hole in the bottom and a sheet of plastic tight over the top. Air is forced out by hitting the plastic hard - and can force the air to knock a paper cup off someone's head!
Air can be described as a fluid the way it moves around.
Here's a link to how to make a miniature version of this at home - let us know how you get on!