Fun Project Idea: Floating egg!

February 7th, 2013 : No Comments

Fun Project Idea - Cikgu.tv e-learning for kids

Fun Project Idea - Cikgu.tv e-learning for kids

How to make an egg float

If you drop an egg into a glass of ordinary drinking water, the egg sinks to the bottom. But, what will happen to the egg if you add salt into the glass? The results are interesting and can teach you some fun facts about density.

    What you’ll need:

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

  • Pour water into the glass until it is about half full.
  • Stir in lots of salt (about 7 to 8 tablespoons).
  • Carefully pour in plain water until the glass is nearly full (be careful to not disturb or mix the salty water with the plain water).
  • Gently lower the egg into the water and watch what happens.

What’s happening?

Salt water is denser than ordinary tap water. Always remember, the denser the liquid, the easier it is for an object to float in it. When you lower the egg into the liquid it drops through the normal tap water until it reaches the salty water, at this point the water is dense enough for the egg to float. If you were careful when you added the tap water to the salt water, they will not have mixed, enabling the egg to float in the middle of the glass.

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