Make an egg float

Last weeks experiment showed how to make an egg shell disappear, this week we are showing you more science magic and showing you how to make an egg float.


What you need

  • A bowl or large glass

  • Tap water

  • Table salt

  • Egg



  • Fill the bowl or glass about 2/3 full with tap water.

  • Drop the egg carefully into the bowl and observe it sinking to the bottom.

  • Remove the egg and add salt, I added about 5 tablespoons then tried it again, adding more and more until it floated.



Here you can see the egg floating.

The Science Bit

Objects sink in water when they are more dense than the water, by adding salt we make the water more dense, once  the water is denser than the egg it floats.

You could also try other objects and see what else you can make float. You can see more sinking and floating fun here.



Author: Emma Vanstone

Science Sparks, is a site dedicated to making Science fun for kids. I’d love you to follow me on my Google Profile+.

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  1. This is one of the first science ‘tricks’ I remember from primary school days :0) its cool!

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  2. I love science experiments like this! Can’t wait to try it.

    Post a Reply
    • Let us know if you enjoy it!

      Post a Reply
  3. Mmmh, I am sure I was told a floating egg is a bad egg.. is this how you can play tricks on people too? :-)

    Thank you for sharing on Kids Get Crafty!


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  4. What a fun experiment. I can’t wait to put this experiment into our science lessons. I can’t believe how many fun experiments you do on your site. Educational and fun.

    -Veronica @

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    • wow, thank you. That is so lovely to hear. x

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    • So glad you like it!

      Post a Reply
  5. oh, you know I LOVE it! Keeping this in my back pocket for around Easter – perfect!!!

    thanks for sharing on the sunday showcase! I pinned this!

    Post a Reply


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