The average American eats about 52 quarts of popcorn per year. Think about that the next time you sit down for a movie with a big bowl of popcorn. The science behind corn popping is as simple as boiling water. The physical change in popcorn allows students a tangible experiment to see how mass and volume are two different measurements of matter. This procedure gives you an opportunity to use student measurements of mass and volume to see how volume can change while the overall mass of the system remains constant. The experiment can also initiate a discussion on the laws of conservation of mass and energy, allowing students to consider how mass can remain the same even after the substance has undergone a physical change, such as going from kernels to popcorn.