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Egg in Salt Water Science Experiment

Ubooly – Educational Toy

How to float egg in water? This is the science experiment we are doing today. We love easy kitchen science expriments that required no preparation. Today’s experiment just need salt, water and egg. It is very fun and easy. Kids as young as preschool age can do it on their own with adult guidance and supervision. From the activity, kids learn liquid density and buoyancy.

We get the idea from an app called Ubooly. We were bored at home, and took out Ubooly to find something to do. In the ocean science unit, there is this egg in salt water experiment.

Egg in Salt Water Experiment Materials

Everything you need can be easily found in your kitchen.
1. A glass that you can see through. To save water and salt, I suggest a glass that is not too big. As long as you can fit an egg into the glass, it should work.
2. Water. No special requirement, just tap water.
3. Salt. Again, just regular salt you use for cooking.
4. A raw egg.
5. A spoon. This is optional. If you child doesn’t want to touch the salt, you can offer a spoon for adding salt into the water.
Egg float in the salt water. Experimenting density and buoyancy

Egg in Salt Water Experiment Steps

1. Fill the glass with water. Make sure it is not full. You wan to have space for egg too.
2. Add the raw egg into the glass gentally.
3. Take note where the egg is. Is it at the bottom of glass? or the middle floating in the water? or above the water?
4. Add salt into the water. Gentally stir the water to help the salt dissolve in the water. Keep adding salt into the glass till you start seeing the egg start to floating in the water. For us, it started to float up when we added about 4 spoons of salt.
5. Record your observation.

Egg start to float in the salt water. Experimenting density and buoyancy

Egg Float in Salt Water Experiment Science Explanation

As amazing as it looks, the science behind the egg floating in salt water is quite simple. The density of salt water is greater than fresh water. But why?

What is density? Density is the amount of matter contained in a given space or volume. When there’s more amount of matter in a given space or volume, the object is considered denser.

Why do objects float or sink? An easy answer is an object sinks when its own density is greater than the medium’s density. In this egg salt water experiment, egg is the object, water and salt water are the medium. The egg is denser than fresh water, so it sinks in water without salt. By adding salt into the water, we increased the water’s density. Once the salt water’s density becomes greater than egg’s density, the egg starts to float.

Why salt water is denser than water? When salt is added and dissolved in water, it breaks down into ions that are attracted to the water molecules. This attraction causes them to bind, thus increases the amount of matter per volume (density). Instead of just having hydrogen and oxygen molecules in the water, sodium and chlorine in salt are also in the medium. This is why salt water is denser than tap water.

Salt water experiment

Next time when you are at the ocean beach, remember to ask kids why it is easier to float in ocean than to float in lake? They should be able to answer the question now that they’ve done this experiment.

How to make egg float in water? An easy science experiment about density and buoyancy. Kitchen STEM activity for kids all ages

For more easy kitchen STEM activities, check out 10 Salt Science Activities
Magic Silver Egg Science Experiment
kids science experiments with salt
Silver egg magic kitchen science experiment

Ubooly the educational toy is available on Amazon. Designed for kids age 4 to 10. Amazon link below leads to the toy.
Ubooly Toy

Looking for more STEM Toys for Kids?
Awesome STEM Toys for Kids
Best STEM Gifts for Kids

{ 38 comments… add one }
  • Emily. L

    Looks great, thanks for yet another great science idea!

  • Anne N.

    I like it is educational.

  • Monica Zhelyazkova

    I like that its fluffy and cute

  • Nicole Newby

    I love it because it will probably entertain both my son and boyfriend.

  • Christy Colln

    works with my phone!

  • Kim

    It’s nice that it’s so mobile and it’s educational which I’m all for.

    • you can definitely take the toy with you anywhere. If not, just use phone also works.

  • Heather Manu

    I like that it works with my phone.

  • Jessica Peeling

    I like that it can do an endless amount of things to keep everyone entertained!

    • Yes there are so many stories jokes and activities in it, there will hours and hours fun …

  • tina reynolds

    I like it works with my iphone it would really entertain my son

  • Brandy Fisk

    I like that it works on a iPhone!

  • latanya

    that is interactive

  • CD

    my girls would love the interactiveness of ubooly! Looks fun for travelling with too.

  • Niamh

    It is so cute!!!!!

  • Sugi

    this looks like a very interactive toy, and small enough for summer travel.

  • Anna

    Too bad not available for those of us that can’t afford an Iphone 🙁 I have an Android. Seems like a great, fun and interactive thing to keep my 6 year old busy and entertained…especially while out.

  • Kelly

    Cute app my 3yo enjoys it! Thanks for the post!

  • Jennifer Dove

    I would love to try Ublooy. My kids 6 & 8 would be a wonderful audience for this app. I have search long and hard for all educational apps for my children and I agree with the igame mom blogger that there are some but not enough with things to do interactive. I would love an opportunity to see a Ubooly toy in action and see how it helps my children not only learn and move, also use it to give them what they want to learn about which is incredible!! This app toy is one of the most inventive things I’ve heard of to date. I would not only watch my children learn but I would put reviews as many places as possible. I appreciate the opportunity.
    Thank you, Jennifer

    • I agree. This is the most interactive and educational toy I have seen.

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