H2O University Grades K-2 Grades 3-5 Grades 6-12 Parent/Teacher Library
Conservation House
Fast Facts
     What is H2O?
     Be a Scientist
     Clean Water
     Leak Seeker
     Water in Food
     Salt vs. Fresh Water


waterSalt Water vs . Fresh Water
How can you tell the difference between salt water and fresh water? Try the experiment below and find out.

You will need:
  • water1 egg
  • A glass of water
  • 12 tablespoons of salt
Begin the experiment:
  1. Fill a glass with water until it is half full.
  2. Put the egg in the glass. What happens? Does it sink or float?
  3. Now add the salt, one tablespoon at a time. Watch what happens to the egg.
Making discoveries
  • eggsThe egg sinks in fresh water. Why do you think this happens?
  • As salt is added to the water, the egg starts to float to the top.
  • The salt makes the water denser. The denser a liquid is, the more likely it is that an object will float.