The document provides instructions for an experiment involving modifying film canisters to float, sink, or be suspended in water. Students are asked to modify three canisters - one to float, one to be suspended, and one to sink. They then measure the mass and volume of each canister to calculate density. Finally, students are asked to predict if given densities would float, sink, or be suspended based on their understanding of density. The summary is in 3 sentences as requested.