What you'll need

  • One egg
  • Water
  • Salt
  • A tall drinking glass


  1. Pour water into the glass until it is about half full
  2. Stir in 6 tablespoons of salt
  3. Carefully pour in plain water until the glass is nearly full (note: pour in gently to avoid mixing the salt water with the plain water)
  4. Gently lower the egg into the water and watch what happens

What's happening?

  • Salt water is denser than ordinary water
  • The denser the liquid the easier it is for an object to float in
  • When you lower the egg into the liquid it drops through the normal tap water until it reaches the salty water which is dense enough so that the egg floats.

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