Why does popcorn pop?

We have been looking at the way Science investigations work. This is the process – first we ask a ‘key question’, then we predict what we think the answer might be. We test our ideas and finally we review our ‘key question’. In this film, we are looking at how materials are transformed when heat is applied. We all love popcorn, but do we ever ask ourselves ‘why popcorn pops?’ and what is the best way to make it edible? Watch us as we find out more.