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    Home » Kitchen Science » Make an Egg Float

    Make an Egg Float

    February 10, 2021 By Emma Vanstone 18 Comments

    Fresh eggs sink and older eggs float. Eggs have an air cell that become bigger as they age. Once the air pocket is big enough to make the egg less dense than water the egg floats!!

    Another way to make an egg float is to increase the density of the water the egg is in! Once the water becomes denser than the egg, the egg will float.

    This easy kitchen science experiment just needs salt, water and a container.

    Image of children doing an egg experiment, using salt and water

    How to make an egg float

    You’ll need:

    • A bowl or large glass
    • Tap water
    • Table salt
    • Fresh Egg

    Instructions

    • Fill the bowl or glass about ⅔ full with tap water.
    • Drop the egg carefully into the bowl and watch as it sinks to the bottom.
    • Remove the egg and add salt to the water stirring continuously. Keep adding salt until the egg floats.
    Image shows one glass filled with salt water with an egg floating on the surface and one glass filled with fresh water with the egg at the bottom.

    Why does an egg float in salty water?

    Objects sink when they are more dense than the water and float if they are less dense than water.

    Adding salt increases the density of the water.

    Once the water is more dense than the egg, the egg floats.

    egg floating in salt water

    You could also try other objects and see what else you can make float. Why not try one of my other sink or float experiments?

    More Kitchen Science Experiments for Kids

    Find out how to make an egg bounce.

    Discover how to bake ice cream in an oven without it melting.

    Learn about the maillard reaction, find out what a leavening agent is and more science in the kitchen with a science bake off!

    Find out why honeycomb is bubbly.

    Rainy Day Mum uses honeycomb to talk about igneous rocks!

    I also have a HUGE collection of kitchen science experiments that will keep you busy for months!

     

    Last Updated on March 3, 2022 by Emma Vanstone

    « Bouncy Egg Experiment
    The science of pancakes »

    Safety Notice

    Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

    These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

    Reader Interactions

    Comments

    1. MsXpat

      January 23, 2012 at 3:43 pm

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

      Reply
    2. Betsy

      January 23, 2012 at 4:05 pm

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

      Reply
      • ScienceSparks

        January 26, 2012 at 8:12 pm

        Let us know if you enjoy it!

        Reply
    3. maggy,red ted art

      January 26, 2012 at 6:20 pm

      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!

      Maggy

      Reply
      • ScienceSparks

        January 26, 2012 at 8:11 pm

        ha ha :-))

        Reply
    4. Veronica

      January 26, 2012 at 7:29 pm

      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 @ http://watchmeplaynlearn.blogspot.com/

      Reply
      • ScienceSparks

        January 26, 2012 at 8:10 pm

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

        Reply
    5. Brooke, Let kids create

      January 30, 2012 at 5:49 am

      That is so cool. I never knew you could do that (unless the egg was bad) Thanks for sharing on Monday Madness.

      Reply
      • ScienceSparks

        January 30, 2012 at 12:42 pm

        So glad you like it!

        Reply
    6. Mom to 2 Posh Lil Divas

      February 04, 2012 at 1:38 pm

      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!

      Reply
    7. Emma bloomfield.

      March 17, 2015 at 10:27 pm

      I am doing this to show my class room 6.

      Reply
    8. Yusuf Kariem

      March 29, 2017 at 2:18 pm

      Wow so cool
      Had fun helping my daughter make it

      Reply
    9. Cynthia

      April 17, 2020 at 5:36 pm

      This is the best prank to pull on my son. He is in collage and he is a great chef. knows everything! Thanks.

      Reply

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