Archimedes buoyancy density
Age Group
13 14 15
Expected time
1 period
Mysterious eggs.PDF
beaker symbol

Mysterious eggs

What’s the mystery? This is a mystery that allows the students to make a hypothesis based on the old advice saying that a rotten egg floats when it is put into fresh water while a fresh egg sinks.
Domain(s) Physics
Subdomain keywords Density, Archimedes, buoyancy.
Age group 13 to 15 years old.
Expected time for the mystery Approximate time for teacher preparation: one hour.Approximate time in classroom: one hour.
Safety/supervision If a burner is used, students must be supervised properly.Disclaimer: the authors of this teaching material will not be held responsible for any injury or damage to persons or properties that might occur in its use.
Preparation and list of materials Butane burners, tripod, measuring cylinder, weight, matches, salt, eggs. Other variants are also possible.
Learning objectives Explain what density is and why something floats. Conduct experiments and find sources of error (science concept).