Buoyancy in Water

This Buoyancy in Water activity & project also includes:

Change where an object floats in water. Pupils experiment with a Cartesian diver by squeezing on the side of a plastic bottle. Learners pay attention to the bulb of the pipette as the bottle is squeezed to determine what is happening within the bottle. Then, they come up with an explanation of what is causing the diver to sink and rise.

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Instructional Ideas
  • Research Argo floats
  • Older groups can build their own Cartesian divers
Classroom Considerations
  • Requires the teacher to build a Cartesian diver prior to the activity
  • Includes a description of the science involved
  • Provides suggestions for extensions
  • None