I use this lab to introduce density. This is the lab sheet I use with my students to enhance the learning. We start by making metal boats with aluminum foil. Each group gets 5 feet of tin foil, 10 paper clips, and a piece of card stock paper to create their boat. They have 30 minutes or a class period to do this. They then must put their boats in water and measure how much mass it can hold before the boat becomes more dense than the water.