2B40.20 Archimedes' Principle
Buoyancy, Archimedes' principle
This experiment compares the buoyant force on an immersed cylinder and the weight of water displaced by the cylinder.
-  Steel cylinder
-  Steel cup
-  Glass beaker with downward spout
-  Glass beaker
-  Spring scale
-  Bottle of water
-  Lab jack
- Put the large-spouted beaker on the lab jack and position the other beaker to catch the runoff from the spout. Adjust the lab jack as necessary.
- Fill the large-spouted beaker with water.
- Keep electronics away from the water!
- Use the spring scale to measure the mass of the cylinder.
- Lower the cylinder into the large-spouted beaker until the cylinder is immersed. Make sure the other beaker catches the runoff.
- Read off the apparent mass of the immersed cylinder. The difference in mass can be used to calculate the buoyant force.
- Carefully pull the cylinder out of the water.
- Show that the cylinder fits snugly in the cup.
- Measure the mass of the empty cup.
- Add the runoff water to the cup. Show that the cup is full.
- Measure the mass of the water and the cup. The weight of the water should equal the buoyant force.
- PIRA 2B40.20
- Don't attempt this at home!
If you have any questions about the demos or notes you would like to add to this page, contact Ricky Chu at ricky_chu AT sfu DOT ca.