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!

Get a Full Week of Egg Theme Learning and Play

Save time and get right to the playful learning with our printable lesson plan sets. Each set includes over 30 playful learning activities related to the theme, and we’ve provided different versions for home preschool families and classroom teachers so all activities are geared directly toward your needs.


This set includes active hands-on learning ideas and the following printables:

1) Egg Beginning Sound Sorting Activity
2) Uppercase and Lowercase Egg Puzzles
3) 0-35 Egg Number Cards
4) 1-20 Number Basket Sorting Mats
5) Numbers and Sets Matching Puzzles (2 variations for differentiated instruction)
6) Oviparous Animals Emergent Reader (2 variations)
7) 4 Math Game Cubes
8) Egg Cards (for patterning, sorting, and ordering by size)
9) Oviparous and Non Oviparous Animal Sorting Activity
10)Oviparous animal word cards

Get Your Lesson Plans

Home Preschool Egg  Theme Lesson Plans

Preschool Classroom Egg Theme Lesson Plans

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



More Math and Science Activities with Fizz, Pop, Bang!

Fizz, Pop, Bang! Playful Science and Math Activities is designed to bring hands-on fun to math and science play. It’s full of engaging and powerful learning opportunities in math and science, shared through ideas that incorporate art, play, sensory learning and discovery, for a whole-brain approach.

It includes 40 educational projects and 20 printables including a set of build-your-own 3D shape blocks, engineering challenge cards and a range of math games.

Learn more about Fizz, Pop, Bang! or you can buy it now!

Buy Now-Fizz Pop Bang ebook with 40 projects for ages 3 to 8 and 20 free printable resources

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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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