Updated 2018 – Spreadsheet that will graph 20 trials, along with the Density of Water
Purpose: Change the density of the film canister so that 97-99% of the canister is suspending under water (very SLOWLY floating from the bottom to the top of the tank).
- Film canisters with secure lids – one per student
- small objects of different masses – pebbles, pennies, etc…
- lunch tray to hold materials for each group of students
- deep enough ‘tank’ and a spoon to fish items out
- Triple Beam Balance
- Google Sheets: Dunkin’ for Density Spreadsheet 2018
- Google Doc Public Link – Student worksheet and directions
Set up hints – students prep items at their table then come up to the tank. After dunking, dry off with towels (I just drop it onto a thick folded up towel next to the tank). I have a bank of TBBs set up on the side of the classroom – students find the mass on their assigned TBBs then record results. Repeat trials. Towards the end of class, students enter all their data into the spreadsheet then I give them the volume of their film canister. Depending on the type of film canister, the volumes are about 39-41 mL. Confirm with a large graduated cylinder or water displacement tank.