In this activity, students investigate water density by floating eggs in freshwater and saltwater.

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

  • discuss the concept of density
  • discuss how salt increases the density of water
  • explain why an egg sinks in freshwater but floats when salt is added.

Download the Word file for:

  • introduction/background notes
  • what you need
  • what to do
  • extension idea.
Published 4 September 2008, Updated 22 January 2014