This is a resource for a STEAM/Stem competition. It can be used for a whole year group, or across a key stage. I used it for years 6/7/8 and 9. You can buy the Film cannisters online relatively cheaply. I include written instructions and a powerpoint. The whole activity can be completed between 90 minutes and 2 hours. The pupils can collect data and present the data using a line graph or bar chart depending on age. Safety goggles are a requirement.