In this lab, students will be investigating different materials to find out which material is the best thermal insulator. First, students measure the length of three ice cubes. Then, they place each ice cube in a different cup for twenty minutes. Next, they record the size of each ice cube. Then, they place the ice cubes back in the cups and wait another twenty minutes. They record the size once again. Finally, students graph their results to determine which material is the best thermal insulator.