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.
Density, Archimedes, buoyancy.
13 to 15 years old.
Expected time for the mystery
Approximate time for teacher preparation: one hour.Approximate time in classroom: one hour.
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.
Explain what density is and why something floats. Conduct experiments and find sources of error (science concept).