In this activity, students make a Cartesian diver to demonstrate the relationship between volume, mass and density. A similar principle is used in Argo scientific floats.

By the end of this activity, students should be able to:

  • describe some of the factors that affect what makes an object float or sink
  • understand how changing the volume of something, but not its mass, will change its density
  • understand how Argo floats rise and sink in the ocean.

Download the Word file for:

  • introduction/background notes
  • what you need
  • what to do
  • extension ideas.
    Published 18 June 2010