Materials List: Eureka!
Or Buoyancy and Archimedes' Principle

Each group needs:

  • ruler
  • graduated cylinder marked in milliliters (alternatively, provide a 2-liter bottle with the top cut off and a ruler so students can measure displacement in cm and calculate volume)
  • scale (can be digital), to measure mass in grams
  • known objects of a variety of materials, such as wood, steel, aluminum, plastic, glass, Styrofoam, water and oil; these objects can be found (glass marbles, steel marbles, wood blocks, etc.) or cut to appropriate size; find items in your home, school shop or hardware store
  • irregularly shaped "mystery object" of unknown material; make it the same material as one of the known objects, but irregular in shape and masked with paint or tape to conceal its identity
  • 4 plastic 500-ml drinking bottles
  • aluminum foil, 1 sheet
  • Eureka - Archimedes Principle Worksheet 1, one per student
  • Eureka - Archimedes Principle Worksheet 2, one per student