Density Dan’s Stir It Up


To learn that salt water is denser than fresh water


  • Two clear plastic cups or drinking glasses
  •  Four tablespoons of table salt*
  •  Two raw eggs
  •  Water


Fill both cups three-quarters full of water. Add four tablespoons of table salt to one of the cups of water. Add nothing to the other cup. Place one egg in each cup.


The egg floats in the salt water because it is not as heavy or dense as the salty water. The egg in the fresh water sinks because it is heavier than the water.*If the egg does not float, add more salt to the water.