Investigation of density using shrinky dink plastic. Using Shrinky Dinks (polyethylene - recycling code 5) to practice density measurements and calculations as well as conservation of mass. I like the shrink film from "Grafix" company and cut the sheets into quarters for this activity. This is a student favorite because even though they are doing math and learning the concept, they get to keep the finished product.
An electronic scale is recommended for mass measurement and rulers for the volume measurements.
Also touches on the law of conservation of mass. Dimesions and mass are measured before the films are placed in a toaster oven (set at 275-310 degrees F). After shrinking, students remeasure and compare their results. Student background about polystyrene production, conclusion questions, and technological applications of shrinky-dinks are included.