This lab is very effective and utilizes multiple skills. Skills used during this lab include calculating mass, triple beam balance skills, graphing, recording data, identifying variables, and using the metric system. This lab requires very little teacher preparation. In the full version, I have included assessment questions over activity and a journal follow-up. Preview version only has the activity (no graph, no journal follow-up, and no follow up assessment questions). Allow approximately 2 hours for entire activity. Popcorn is inexpensive and fun! Submitted by Riki Campbell.