Floating Egg Science Experiment-Comparing Eggs

This week’s theme for Discover & Explore is science experiments. We love to do simple science experiments! I’m excited to see what everyone has to share so we can try a few new ones soon.

In the classroom the kids were always amazed to see this egg trick I found at Funolgy.  It’s simple and quick, but there’s a lot of learning involved too. Lovey and I recently tried a variation of the traditional experiment. We were boiling eggs for breakfast, and Lovey noticed that the eggs in the pan sink to the bottom. I decided to set up this experiment so we can do a little learning before breakfast.

Floating Egg Science Experiment-Comparing Eggs


  • Two glasses 2/3 full of water
  • Two containers of salt (Lovey measured 3/4 of a cup, but you could do the experiment with a bit less.)
  • One raw egg
  • One hard-boiled egg (Mark one egg so you can tell the difference.)


Based on Lovey’s observation earlier that morning. We discussed what we thought might happen. She predicted that the hard-boiled egg would sink and turn the water hot. (We had cooled it by running cold water over it, but it was still warm.) She predicted that the raw egg would float and turn the water cold.

Making Predictions-Floating Egg Experiment


First she dropped the raw egg into the water.

Sink or Float with Eggs

Then she dropped the hard-boiled egg into the water. Both of them sank to the bottom.

Sinking Eggs Preschool Science

Then she slowly poured the salt into the glass with the raw egg. She didn’t think anything was going to happen.

Learning about Density-Simple Science

But WOW was she surprised when that egg popped to the top!

Surprise-The Egg Floats-Science Experiment

Why? Adding salt changes the density of the water, so the egg floats to the top.

Floating Egg

Then she added salt to the glass with the hard-boiled egg to see if it would float, too.

Do Hard-Boiled Eggs Float Science Experiment

And it did!

Comparing raw and hard-boiled eggs science experiment for kids

After finishing the experiment, she wondered whether she could make the egg sink again. She poked at it a bit and had fun watching push its way back to the top each time.

Can you make a floating egg sink

After doing this activity she showed what she had learned in various ways. While cooking with my mother she mentioned they could add water to make things float in their pot. And while playing with pumpkins in the water table, she noted that they float even if there was no salt in the water. I see even more explorations with water density in our future!

Now it’s your turn. We’d love for you to share how you

Discover & Explore: Halloween

Please read the following guidelines for sharing:

  • Share family-friendly posts related to the weekly topic — kids activities, book activities, crafts, recipes, nature outings, free printables–anything that might be helpful to those wanting to put together activities based on this week’s theme
  • By linking up, you are giving me permission to share your post including one photo in our weekly feature post and on social media channels.
  • Visit 2-3 other posts that have linked up, find some new ideas & meet new friends!

The linky will remain open for one week. On Fridays all co-hosts will feature activities in a separate post and share featured posts on the Discover and Explore Pinterest Board.

Discover & Explore Weekly Themed Linky

Don’t forget to visit the other co-hosts to see what they are sharing for this week’s theme.

KC Edventures  **  Buggy and Buddy **  Teach Preschool **  Twodaloo

Upcoming Discover & Explore Themes

  • November 6–Thanksgiving
  • November 13–Cooking with Kids
  • November 20–Life Skills
  • November 27–Gifts
  • December 4–December Holidays


This post has been shared at some of these fantastic link parties.

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  1. What a fun experiment. As you discovered, this is a great way to get children asking questions and taking what they’ve learned and applying their findings to other situations. Great job!


  2. Your daughter must be so full of life – she has such beautiful smiles in your pictures! I love the look of amazement on her face. Thanks for linking up!

  3. Thank you for linking up this idea to ‘Share It Saturday’. I look forward to featuring it this weekend.
    Hopefully you will be able to link up more of your brilliant ideas.

  4. The expressions you captured on your daughter’s face say it all. What a great experiment! I would love it if you link up with Entertaining and Educational this Friday. – http://highhillhomeschool.blogspot.com

  5. Great experiment! I need to try this with my kiddos!

  6. We love this experiment – we did a while back when we talked about Israel and The Dead Sea. So fun! Thanks for sharing with Afterschool!

  7. This is such a cool experiment.

  8. Great simple science experiment! It looks like it was a hit. I loved how you incorporated a hypothesis based on what happened earlier.

    • Thank you! I try to focus on discussions a lot when we are doing science and math activities. This was often a challenge for my kindergarten students in the classroom, so I try to give the kids a lot of practice discussing their ideas and observations.

  9. Thanks for hosting! Now following from Scrappy Bag Lady

  10. Eggs are great fun with science…and salt! We had fun with lemons this week!

  11. What fun! I can almost hear her giggling as the egg pops back.

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