floating an egg experiment

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Floating Egg Science Experiment

Can you make an egg float in water? In this simple science experiment, we take just a few minutes to test the laws of density and discover just how easy it is to make an egg float!

Below you’ll find detailed instructions and our demonstration video as well as the scientific explanation of “why it works.” We’ve also included a more ideas to explore the concept a bit further.

JUMP TO SECTION: Instructions | Video Tutorial | How it Works

Supplies Needed

2 Tall Drinking Glass

Floating Egg Science Lab Kit – Only $5

Use our easy Floating Egg Science Lab Kit to grab your students’ attention without the stress of planning!

It’s everything you need to make science easy for teachers and fun for students — using inexpensive materials you probably already have in your storage closet!

Floating Egg Science Experiment Instructions

Experiment Setup – Start with some observations about the eggs. Note that they are both raw eggs and have a similar size and weight. Then ask some questions. Do you think that the eggs will sink or float when placed in water? Do you think it’s possible to make them float? If so, how? Write down your hypothesis (prediction) and then follow the steps below.

Step 1 – Fill a tall drinking glass about 3/4 full of water and carefully place the egg into the glass. What happens to the egg? That’s right, it sinks to the bottom.

Did you know there is a way to make it float? Continue on in the experiment to find out how.

Step 2 – Fill another tall drinking glass about 3/4 full of water.

Step 3 – Add 3 Tablespoons of salt to the water and stir until it is completely combined. What do you think will happen if you place the egg into the glass with the salt water? Write down your hypothesis (prediction) and then test it to see if you were right.

Step 5 – Next carefully place the second egg into the glass with the salt water. What happens to the egg? That’s right, it floats. Take a moment to make some observations. Why do you think one egg sinks and the other egg floats?

Find out the answer in the how does this experiment work section below.

Video Tutorial

How Does the Floating Egg Science Experiment Work

Why does the egg sink in regular tap water, but float in saltwater? The answer lies in the density of water!

Density is a measure of the mass per unit volume of a substance. Simply said, how much “stuff” in a given volume. Water has a density of 1 g/mL (g/cm3). Objects will float in water if their density is less than 1 g/mL. Objects will sink in water if their density is greater than 1 g/mL.

The egg will sink in regular tap water because the density of the egg is greater than the density of water. The egg’s density is only slightly higher than water at 1.03 g/mL, but that is enough to make the egg sink.

When you add salt to the water, you are increasing the density of the water by adding more mass (or stuff) in the given volume. You don’t really change the volume of the water by adding salt. By adding enough salt, you increase the density of the water so that it is higher than the density of the egg and the egg will float!

Other Ideas to Try

Try this experiment again, but instead of using an egg use a potato slice or a carrot slice. You will have to play around with the amount of salt you add to the water because all objects have their own unique density. Add salt a tablespoon at a time and mix well until you cannot see any salt in the solution, then add your object to see if it floats or sinks. Remove your object and keep adding salt until you can get your object to float. To make it a true science experiment, create a data table to keep track of how much salt you add to the solution.

I hope you enjoyed the experiment. Here are some printable instructions.

Drinking Glass

Instructions

Fill a tall drinking glass about 3/4 full of water
Place the egg into the glass of watch and watch it sink
Fill another tall drinking glass about 3/4 full of water
Add 3 Tablespoons of Salt and stir until combined
Place the egg into the glass and watch it float

Reader Interactions

April 3, 2019 at 2:58 pm

i love this experiment

January 23, 2020 at 11:14 pm

I really loved doing this experiment with my class

August 26, 2020 at 2:59 pm

The egg floats because the density of the salt water changes to be greater than the egg and the density of the egg becomes less dense so then the egg floats. But when you put an egg in tapwater the density of the egg is greater than the density of the tapwater which makes the egg sink.

January 20, 2022 at 11:33 am

bro I loved this experiment it was amazing!!! I tried it out with my friends and it worked! Thank you!

February 10, 2022 at 7:19 pm

this is very helpful thank you

March 7, 2022 at 9:56 am

i loved this experiment : )

April 16, 2023 at 11:35 am

I love doing this experiment at home

May 1, 2023 at 9:00 am

It’s amazing thank you for sharing.

November 3, 2023 at 10:18 am

This is my science fair experiment! YAY!

November 25, 2023 at 7:41 am

wow what a great experiment m!!!

Floating Egg Experiment

Will an egg float in fresh or salt water.

Will an egg float in fresh or salt water? The Floating Egg Experiment is an easy hands-on investigation that can be done in your own kitchen! I have used this lab before as a class demonstration, group lab investigation, and with my own kids at home. There are several science terms and concepts that can be taught in this experiment including density, solutions, mixtures, saturation, concentration, mass, and the list goes on. Scroll to the bottom to download your own Floating Egg Experiment Lab Sheet!

*Don’t miss out on the Salt Water Density Lab featuring a free observation lab sheet too! And be sure to check out all of our FREE Science Resources including our Labs & Experiments !

As a Christian Book and Amazon affiliate, we may earn commissions from qualifying purchases. Thank you for your support. As always, we only recommend items that we truly feel will benefit your homeschooling experience. We appreciate it.

Floating Egg Experiment Introduction

Before conducting the experiment, there are a few things you should cover with your students to create a meaningful learning experience. First, spend time talking about the terms below. We discuss the meaning of salinity and a homogeneous mixture amongst other concepts. Since this investigation is demonstrating the difference in density between salt water (oceans) and fresh water (rivers, lakes, ice), it works well with our Water Distribution Unit .

Important Terms and Facts

– Salinity describes the amount of salt dissolved in water. Saline water is water with salt dissolved in it.

– A homogeneous mixture is a type of mixture where a solute (salt) is dissolved into a solvent (water). This type of homogeneous mixture is called a solution .

– Density is the amount of mass in volume. Volume is the amount of space something takes up.

– Buoyancy is a force on an object making that object rise or move forward.

Floating Egg Experiment Lab Sheets

Write hypothesis.

Once you have introduced the key terms in the Floating Egg Experiment, make sure the students are given the following facts and the FREE FLOATING EGG EXPERIMENT LAB SHEETS.

Water has a density of 1 g/mL (g/cm3).
Objects will float in water if their density is less than 1 g/mL.
Lastly, objects will sink in water if their density is greater than 1 g/mL.

After giving your students this information, guide them to write a hypothesis for the posing question, “Will an egg float in salt or fresh water?”

For example, their hypothesis could read like this:

If I add 1 TBSP of salt to every ½ cup of fresh water, a raw egg _____________________________ float.

Students will plug in the words, “will” or “will not,” in the blank of the hypothesis.

Identify Variables

Identifying variables in an experiment is something that takes most students practice. It is a good idea to continuously review the following terms. Check out our Scientific Method unit to get more practice.

Manipulated Variable – variable that is different in the experiment. It is the thing that is manipulated. *In this case, the manipulated variable is the amount of salt added to the water.

Responding Variable – variable that is being tested. It responds to the manipulated variable. *Hence, if the egg floats or not.

Controlled Variable – variable(s) in the experiment that do not change or remain the same. *In this lab, the glasses and raw egg are the controlled variables.

Review the experiment before conducting...

For you teachers, it is always advisable to try an experiment out first to ensure that it works the way it is supposed to. There is nothing worse than demonstrating in front of a group of students for an experiment to flop! It has happened to the best of us… yes, it has happened to me! Watch this video I found on YouTube to get a step by step of the experiment. It is pretty easy to demonstrate.

I have used this experiment for years with the exception of the salt water with the fresh water on top. That aspect of the experiment was new to me. So, I too tried this at home before showing it to my students. *I wonder if it will work with glasses that aren’t quite so narrow at the bottom? Let’s see…

Gather Materials

The materials list is likely to all be found within your kitchen. I love experiments that do not require a tricky supply list. So, gather 3 raw eggs, water, salt, a spoon, 3 clear glasses, and a measuring cup and tablespoon come in handy.

Fresh Water first and then Salt Water

I always start demonstrating the egg sinking in the fresh water first. Next, you will show how adding salt to the fresh water will change its density. Thus, the egg will now float in the denser salt water. In the Egg Floating Experiment, I use 1 tablespoon of salt per 1/2 cup of water. This enables the students to measure more precisely. Some kids need the restrictions.

*On their lab sheets, students will draw and record observations and make conclusions.

Extended Learning...

This aspect of the Floating Egg Experiment is a new for me. I never did this in years past, but what a great addition. You can choose to demonstrate this last glass or the students can continue to follow the procedures on their lab sheet. In the end, take the time to talk about the science behind this experiment. This is where the science comes all together!

What's the Science behind it?

It’s very important that before, during, and after an experiment that you are explaining the science behind the experiment. If you skip this step, then the lab becomes merely a fun hands-on activity with no real science connections. The experiments are meant to help the students get past the surface and begin to soak in the abstract and unseen science behind it.

Glass #1 – The egg sunk to the bottom in glass #1 because the egg is more dense than the water. Hence, the egg has more mass in its volume than the water does.

Glass #2 – The egg floats in salt water because the salt water is more dense than the egg. This means that the salt water has more mass in its volume than the egg does. The salt adds mass to the volume of the water creating a more dense liquid.

Glass #3 – When the egg is put in the cup, the glass is only half full with a mixture of salt and water. This causes the egg to float in the salt water instead of sinking. When plain water is added to the salt water, the egg remains in the middle of the glass because of density. The plain water is the least dense, then the egg, and the most dense is the salt water at the bottom of the glass.

*When the floating eggs are pushed into the salt water, the eggs float right back up to the top of the salt water. This is due to buoyancy. The force of the salt water causes the egg to rise back up.

DOWNLOAD FLOATING EGG EXPERIMENT LAB SHEETS

Check out these other free resources.

John 4:14 – But whosoever drinketh of the water that I shall give him shall never thirst; but the water that I shall give him shall be in him a well of water springing up into everlasting life.

Salty Science: Floating Eggs in Water

A density demonstration from Science Buddies

By Science Buddies

Key concepts Density Mass Volume Concentration Buoyancy Water Introduction Have you ever wondered why some objects float in water and others sink? It has to do with the density of the objects compared with the density of the water surrounding them. If an object is less dense than the water around it, it will float. Because salt water is denser than freshwater, some things float more easily in the ocean—or extremely salty bodies of the water, such as the Dead Sea. You can make your own dense water by adding salt to tap water. In fact, if you add enough salt, you can make the water so dense that an egg will actually float in it! Explore how this works in this science activity. Background If you put an egg in a cup of tap water, it will sink to the bottom. Why is this? Because the density of the egg is higher than the density of tap water, so it sinks. Density is the mass of a material per unit volume. For example, the density of freshwater under standard conditions is approximately one gram per cubic centimeter. But, if you add enough salt to the water, the egg will actually float back up to the surface! Adding salt to the water increases the density of the solution because the salt increases the mass without changing the volume very much. When enough salt is added to the water, the saltwater solution's density becomes higher than the egg's, so the egg will then float! The ability of something, like the egg, to float in water or some other liquid is known as buoyancy. But just how much salt is needed to make an egg float? In this science activity you'll figure that out by making solutions with varying concentrations of salt in them. Materials

Measuring cup

Large container, such as a large bowl or cooking pot (It must be able to hold at least three cups.)

One half cup of table salt

Five cups that hold at least 16 ounces each

Permanent marker (if you are using plastic cups) or masking tape and a pen (to label nondisposable cups)

Three spoons for mixing salty solutions

Soup spoon for egg transfers

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Preparation

Take the egg out of the refrigerator and allow it to warm to room temperature. Be sure to always wash your hands after handling uncooked eggs because they may carry salmonella.

Pour one and one half cups of water into your large container.

Add one half cup of salt to the large container and stir to dissolve some of the salt (it will not all dissolve yet).

Add one more cup of water to the large container (making two and one half cups total) and stir to dissolve the remaining salt. The salt should be completely dissolved before you go on to the next step. It may take several (five to 10) minutes of stirring, so you may need to be patient. Why do you think it's important to start out with a solution that has such a high concentration of salt?

Arrange the five cups on a surface, going in a line from left to right. Label the cups 1 to 5. If you are using plastic cups, you can use a permanent marker to label them. If you are using nondisposable cups, you can use masking tape and a pen to label them.

Add three quarters cup of the salty solution you prepared to cup 1.

Add three quarters cup of plain tap water to cups 2 through 5. (Cup 5 will be plain tap water.)

Add three quarters cup of the salty solution you prepared to cup 2 and mix it. What is the salt concentration in cup two compared with cup one?

Add three quarters cup of the salt solution from cup 2 to cup 3 and mix it. What is the salt concentration in cup 3 compared with cups 1 and 2?

Add three quarters cup of the salt solution from cup 3 to cup 4 and mix it. What is the salt concentration in cup 4 compared with the other cups?

Use a soup spoon to place an egg in cup 5. Does the egg float?

Use the spoon to take the egg out and place it in cup 4. Does the egg float?

Repeat this process with cups 3, 2 and then 1. In which cup does the egg first float? If the egg floated in more than one cup, did you notice any difference in how it floated? What does this tell you about the density of the egg?

Extra: In this science activity you figured out, within a factor of two, how much salt it takes to float an egg. You could narrow down the range further by testing additional saltwater solutions to try and determine the egg’s density. To do this, start your solution with the salt concentration in which the egg first floated and make a new dilution series, as you did before. Now in which cup does the egg first float? What does this tell you about the density of the egg?

Extra: Repeat this activity using several more eggs, possibly both hard-boiled and uncooked eggs. Do you get the same results with other eggs or is there some variation between different eggs? For testing hard-boiled versus raw eggs, you should test the same egg, first raw and then after hard-boiling it to investigate any differences.

Extra: Find out how much salt there is in seawater. From the results of your activity, do you think an egg would float or sink in seawater?

[break] Observations and results Did the egg float in cup 1 and 2, but not in cups 3, 4 or 5? You likely saw that the egg floated best in cup 1, floated a little less in cup 2 (but part of it was above the surface) and did not float in the other cups. Cup 1 had the undiluted salty solution that you originally prepared, which was one half cup of salt in two and one half cups water total. The concentrations of the salt solutions in cups 2 to 4 were halved as you increased in cup number; for example, the concentration of the salt in cup 2 was half that of cup 1, and the concentration of the salt in cup 3 was half again of cup 2. (Cup 5 had plain tap water.) The egg should have sunk in cups 3, 4 and 5 because the density of the egg was higher than the density of the solutions (or plain tap water) in those cups. Cups 1 and 2 had more salt in them than the other cups (with cup 1 having the most salt), which means these solutions were denser. The egg should have floated (with part of it above the water surface) in these two cups because the solutions were denser than the egg. The actual density of the egg is in between the density of the solution in cup 3 and that in cup 2. More to explore What Is Density? , from Charles E. Ophardt, Elmhurst College Why Is the Ocean Salty? , from Herbert Swenson, U.S. Geological Survey Publication Fun, Science Activities for You and Your Family , from Science Buddies How Salty Does the Sea Have to Be for an Egg to Float? , from Science Buddies

This activity brought to you in partnership with Science Buddies

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Floating Egg Experiment

This floating egg experiment is a lot of fun for kids to try! You can get an egg to float in the middle of the glass and it’s almost like a magic trick! You only need eggs, salt and water. Kids can learn about density with this cool science experiment!

RELATED: Dancing Corn Experiment

Floating Egg Science Experiment

Have you ever made an object float? How about when you go swimming in salt water, do you notice you float much more easily?

This science experiment explores the difference between salt water and fresh water and why objects float in salt water!

Watch the Video Tutorial!

The science.

This is a classic science experiment that shows how changes in the density of a liquid can affect whether an egg sinks or floats.

When you place an egg in regular water, it will sink to the bottom of the glass because the egg is denser than the water. There are more molecules per square inch in the egg than the water, causing the egg to sink.

When you start to add salt to the water, the salt dissolves and the molecules spread out and increase the density of the water. Now there are more molecules per square inch in the water, which causes the egg to float.

Water Only Glass

The egg sinks because it is more dense than fresh water, meaning there are more molecules per square inch.

Salt Water Glass

Adding salt to the water increases its density by adding more molecules per square inch, causing the egg to float. The egg is less dense than the salt water.

Water & Salt Water Glass

When you fill up the glass halfway with the salt water, the egg floats. When fresh water is added on top, it is less dense than the salt water, so it floats on top, allowing the egg to still float in the middle.

The egg continues to float in between the space where the fresh water meets the salt water because the egg is still less dense than the salt water but more dense than the fresh water.

How to do the Floating Egg Experiment

1. Carefully add your eggs into each cup.

You will need 3 eggs.

2. Pour fresh water (cold tap water is fine) into the first cup.

3. Make the salt water.

Boil hot water in a kettle. Adults to assist with this.

Add 1/4 cup of salt into a pouring cup.

Then add about 2 cups of the hot water.

Stir until dissolved and clear.

Add the hot water into the far right cup until the water line matches the first cup. The egg should now float in this cup.

Note: if it does not float, you need to repeat with more salt and try again.

4. Add the salt water into the middle cup.

Fill until halfway up the cup. The egg should still float. If you do not have enough salt water, repeat the step above to make more.

Now pour fresh water on top of the salt water. The egg should now stay in the middle of the cup.

Now you have all three cups showing how eggs can float or sink in water!

See more science experiments about density:

Dancing Corn Experiment
Oil & Water Experiment

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Make an Egg Float

February 10, 2021 By Emma Vanstone 18 Comments

Fresh eggs sink, and older eggs float. Eggs have air cell that becomes 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. We can increase the density of water with salt.

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

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 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.

You could also try other objects to see what else you can make float. Just remember to check the object sinks in tap water first. 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 reactio n, find out what a l eavening 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 May 5, 2023 by Emma Vanstone

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

January 23, 2012 at 3:43 pm

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

January 23, 2012 at 4:05 pm

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

January 26, 2012 at 8:12 pm

Let us know if you enjoy it!

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!

January 26, 2012 at 8:11 pm

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/

January 26, 2012 at 8:10 pm

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

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.

January 30, 2012 at 12:42 pm

So glad you like it!

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!

March 17, 2015 at 10:27 pm

I am doing this to show my class room 6.

March 29, 2017 at 2:18 pm

Wow so cool Had fun helping my daughter make it

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.

Floating Egg Science Experiment ( Using Salt, Sugar & Saline Water)

December 10, 2020
10 Minute Science , 5-6 Year Olds , 7-9 Year Olds , Physics , Rainy Day Science

Hello everyone! Today we have come up with simple ‘ Floating Egg Science Experiment with a twist’ that can be done within 5-10 minutes.

My kids call it as a pre-breakfast activity. This is an easy and funny experiment to teach density for kids .

We know that some things float in the water and some others not. Do u know why the things sink in the water!? Let us learn something about floating science using eggs.

Floating Egg Experiment

This activity is a cool way to learn the concept – density! We are going to perform the experiment with four different liquids to understand the science behind floating objects in water.

We commonly see that eggs sink when we put in the water. What is the reason behind this!? Does egg sinks the same way when dropped in other liquids? We will perform a simple activity to learn the science behind it.

Try our 20+ Egg Science Experiments

Materials Required for the Activity

Saline water (You can find saline water in any of the local pharmacies)
Four glass jars (Either you take glass jars or beakers, make sure they are tall and wide enough to drop an egg)
Four Raw Eggs (Ensure the eggs are not broken or given any crack to avoid the unnecessary mess with the leaky eggs during experiment)
Fill one tall drinking glass or glass beaker about ¾ full of water.

In the same way, fill the other glass with salt water. To prepare salt water, put 1-2 cups of salt in 500ml of water. Stir it with the spoon. That’s it. You are done with making salt water.

Now it is second drinking glass turn! Fill it with sugar water. Prepare the sugar water same like how we made salt water in previous step.

Saline water! Yes, we are using saline water as well to observe the floating science with eggs. Fill the fourth glass beaker with saline water.

Finally, we have arrived to the kid’s favourite step i.e. dropping egg into the tall drinking glasses.

My younger daughter is eagerly waiting for my instructions to drop the egg in the liquids. When I said so, she carefully dropped the raw eggs into the four glasses filled with four different liquids each.

Ask your kids to observe the results that in which liquid the dropped eggs are floating or sinking.

On the initial test, we only had egg floating in the salt water. The sugar water was not dense enough to make the egg float. So we tried to add more sugar to the already prepared sugar solution.

Finally we made the egg float in the sugar water as the water is now more dense due to the added sugar.

How Does the Floating Egg Science Experiment Work?

Let us discuss the results of our experiment. The raw egg dropped in the tap water sinks immediately as soon as it is dropped. On the other hand the egg in the salt water floats.

We observe the same results with the sugar water as well. The raw egg floats nicely in sugar water as well.

How about our egg in the saline water? The egg didn’t float surprisingly in the saline water.

Now let us discuss on what made the eggs in salt & sugar water float and why the egg in normal tap water and saline water sink!?

Floating And Sinking Density Science Experiments

Science behind floating egg

The egg in the glass of regular tap water sinks to the bottom because the density of egg is more compared to density of water.

Why the egg in salt water floats? When the salt is added to the water, it increases the density of the water and hence the density of the egg slowly becomes lesser than the salt water.

You are dissolving the more the salt into the water means you are increasing the density of water. The denser the liquid is the easier for the object in the water to float.

The same formula applies to the sugar water. The density of sugar water is more than the density of egg.

On the other hand, saline water is made of salt and water. However, the density of the saline water that we used seems to be lower than than egg. Thus it floated in the sugar water and sinked in the saline water.

Density is a concept dealing with how closely a substance is packed to be together.

We will compare this concept with our daily life things. For example: consider we have two bowls one is filled with salad and the other is with rice.

Both are of taken in same quantity but we feel the salad bowl is lighter than the rice bowl because the ingredients are packed tightly in the rice bowl than the salad of lettuce and vegetables which are very light in nature.

In the same way, the molecules in the salt, sugar, and saline water are packed more closely and makes the salt, sugar, and saline water denser than the water where the molecules are packed lighter thus making it less denser.

Even the egg has some density but less than the salt water and hence the egg floats in salt, sugar, and saline water.

So, when you go to swimming pool or beach or ocean, observe that you will float easily and lightly compared to salt water. The denser the liquid, the easier you will float! Amazing right!?

Experiment Extensions

Try different liquids and different substances to dissolve in the water in order to make an egg float.

Try these Density Science Experiments :

9 Layer Density Tower

Hot & Cold Water Experiment

DIY Sugar Density Rainbow

Oil, Food Color & Water – Fireworks

How to make Lava Lamp

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Floating Eggs

To teach students about density by showing that denser salt water will make an egg float.

Project Details

Grade Level

2 clear containers
Measuring spoons
Stirring spoon
Does an egg float better in freshwater or saltwater?
To begin your floating eggs experiment, fill your two containers with water. Make sure the amounts are equal.
Use the measuring spoons to pour seven tablespoons of salt in the first container of water. Do not put any salt in the second container.
Stir the container of water until the salt is completely dissolved. This may take a couple of minutes.
Gently place one raw egg in each container.
Watch the eggs for a few seconds. What happens?

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The floating egg {hands-on density experiment}

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Have you ever noticed that it is easier to float in the ocean than in a swimming pool?

The reason for this has to do with the difference in density between pool water and salt water. Simply put, salt water is more dense than pool water.

But what does this mean?

Density is defined as mass per unit of volume. More casually, we can say that density is “the amount of stuff in a given amount of space.” So if you were to weigh 1 cubic cm of pool water and 1 cubic cm of ocean water, you would find that the ocean water weighs more.

Earlier this year I put together a comprehensive Density STEM Pack with nine different activities that build upon each other to progressively develop students’ understanding of density.

One of the activities in my Density STEM Pack is the floating egg, which gives kids an opportunity to change the density of water, and thereby make an object that usually sinks in water – an egg – float!

Note: Find more STEM activities on my Science Activities for Kids page!

The floating egg: A hands-on science activity for learning about density. Children will learn that an egg sinks in fresh water but floats in salt water. This activity is part of the Density STEM Pack. || Gift of Curiosity

To prepare for the floating egg experiment, gather the following materials:

2 glasses of water
Stirring spoon
1 tablespoon
Optional: towel to mop up any spills

The floating egg: A hands-on science activity for learning about density. This activity is part of the Density STEM Pack. || Gift of Curiosity

Gently place an egg into the first glass of water. Does it sink or float? (It should sink.)

Add about 6 tablespoons of salt to the second glass of water.

Stir until the salt dissolves, although the water may remain cloudy.

Gently place the second egg into the glass of salt water. Does sit sink or float? (It should float. If it does not, add more salt to the water.)

You can get instructions for this activity and several others in my Density STEM Pack .

Here is a sneak peak at the teacher instructions and student instructions for the Floating Egg activity:

Who is the Density STEM Pack appropriate for?

The activities in the Density STEM Pack can be adapted and used with children from preschool through middle school to have fun and learn important concepts about density.

The student worksheets provided for these activities are written for kids in fourth through eight grades, but a teacher or parent could easily adapt all but two of the activities for younger students by working directly with the students rather than asking them to follow the written instructions.

Truly, kids of all ages will have fun with all the activities in this pack!

Want a copy of my Density STEM Pack?

Add this product to your cart by clicking the button below!

Density STEM Pack

More stem activities for kids.

More science posts from Gift of Curiosity:

Bubble STEM activities
Dancing raisins
Advanced patterns worksheets
Jumping colors science activity
Crystallized snowflakes
Introduction to probability
Dissecting an apple
What do ants like to eat?
Make your own telescope
Engineering challenges for kids
The great baking soda and vinegar experiment

Find more great science activities on my Science Activities for Kids page and my Science Activities Pinterest board.

Science Experiment: The Floating Egg

Experiment , Pre-School , Science Experiments , Toddler

11 Comments

As I hovered the egg over a jar of water, I asked my 3.5 year old, “Will it sink or float?” and it reminded me of Dave Letterman’s funny sketch, “Will it Float?” Have you seen it? This science experiment is really easy to set up + clean up, and the lesson learned on the density of water actually stuck with my 3-year old daughter long after the experiment was over. Fun and success!

Clear container: I used a wide jar, but a tall glass would work and you won’t need as much salt
A few cups of salt
Spoon to mix the solution

Place the egg in plain water and talk about whether or not it floats. Pretty simple — it most definitely sinks!

Start adding salt to the water. We added ours little by little, and tested the solution by adding the egg back into the water. My 3 year old poured while my 1-year old mixed. I love these moments when they work and play side-by-side.

Finally, it floats!

My little one loved this step, as she could finally reach the egg, and had some fun picking it up and dropping it back into the water where it “bounced.”

The Science behind the Experiment

The egg won’t float in regular water because it’s heavier than the water. But adding salt to the water makes the water more dense than the egg, and it floats! We have a book called “Let’s Visit Israel,” and my 3-year old will talk about this phenomena when we reach the page about floating in the Dead Sea.

Taking it one step further

Steve Spangler Science has a great idea for dragging this out into one more step. Fill half of a tall glass (that an egg will fit in) with this salty solution and then slowly pour plain tap water down the sides of the glass, being careful not to mix the two solutions. Gently drop the egg in the solution and watch it sink past the plain water, only to stop on top of the salty water! How cool is that?!

What a fun experiment! One of my (undeclared) goals this year is to do more science experiments with my daughters. We just did the naked egg experiment and that was fun, we’ll really have to give this a go. I LOVE Steve Spangler!

Steve Spangler is a favorite!Â We love to do the naked egg experiment as well!

Could also be used to find out if an egg is old – stale eggs will float!

We did this experiment when we learned a bit about Israel (I go there quite often on business trips). I called it “The Dead Sea” experiment. Our personal favorite is penny cleaning.

Very cool! Can’t wait to try this with my kids. Have you left an egg soaking in white vinegar to see what happens? It’s an easy, interesting experiment (and I won’t give the final resultÂ away for anyone curious to give it a try). 🙂

Whoops, just read the other comments and it sounds like everyone knows about the naked egg trick already! Oh well, it’s a good one.

Great experiment! Be careful to use fresh eggs however, because the older an egg gets the more air is contained inside the shell, which will make it float. The “sink or float” experiment is actually how we test to see that our eggs are still fresh!

one of our facebook fans said you can do the same thing with a CARROT!!! Â give it a go! Â who knew??!?!

i love this experiment

my gob this very nice experiment

thanks i learned in this experiment

Comments are closed.

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How to Make an Egg Float In Water!

There's something magical about this experiment.

You'll have to have a go and try it to believe it's not been faked!

Luckily, you'll almost certainly have everything you need waiting for you in your kitchen.

What Do I Need?

Clear glass

How Do I Do It?

STEP1 - Half fill your glass with water and gently lower the egg in.

WARNING: It will sink so be careful otherwise you'll be needing another egg! So now we know that the egg sinks, take it back out again (use your teaspoon to scoop it back out).

STEP2 - Half fill your glass with water and add around 10 teaspoons of salt to it (you can't add 'too much' salt as it's a 'saturated solution' - that really just means that the water is 'full' of salt so any extra you add will just sit at the bottom of the glass.) Pop your egg in and watch it float, pretty cool, huh!

STEP3 - To make it look really magical, very slowly and carefully pour some tap water on top of your floating egg (you have to be very gentle so the fresh water doesn't mix with the salt water). You now have a floating egg!

How to Make an Egg Float - How Do I Do It?

What’s Going On?

It's all to do with density.

The egg is slightly more dense that tap water (so it sinks initially) but less dense than the salt water (so it floats on top of that).

The reason we're able to put the egg in the middle of the glass is, as long as we're careful, the less dense tap water sits on top of the more dense salt water and they don't mix together.

How to Make an Egg Float - What’s Going On?

More Fun Please! - Experiment Like A Real Scientist!

Here's an extra experiment so you can see what's really going on - try adding some food colouring to your glass and see what happens!
Only the top half of the glass gets coloured, why is that?
Does it have to be an egg that you use?
What other objects could you try?

How to Make an Egg Float - Experiment Like A Real Scientist!

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Science project, floating eggs: a pre-breakfast experiment.

Before you get ready for a delicious scramble or omelet, add a bit of science to your morning routine! Do you know why some things float and other things don't? In this experiment, you'll use eggs (and a few scoops of salt) to study the science of floating.

Will an egg float better in salt water or fresh water?

2 clear containers
Measuring spoons
Stirring spoon
To begin your floating eggs experiment, fill your two containers with water. Make sure the amounts are equal. When you're doing a comparing experiment like this, all the variables , or factors that make up the project, should be the same -- except one (in this case, salt water instead of fresh water).
Use the measuring spoons to pour seven tablespoons of salt in the first container of water. Do not put any salt in the second container.
Stir the container of water until the salt is completely dissolved. This may take a couple of minutes.
Gently place one raw egg in each container.
Watch the eggs for a few seconds. What happens?

The egg should float in salt water, but not in fresh water.

The key to this experiment is density . Density deals with how closely packed together a substance is. You can see density in your food. Imagine you have two bowls that are the same size. In one bowl, you have a salad, but the other one is full of a pot pie. Even though each bowl is filled with food, the pot pie is much denser because the ingredients are smooshed closer together than a light salad of lettuce and just a few vegetables.

In the same way, salt water is denser than fresh water. The molecules are packed tighter, and this density allows an egg to float on the water's surface. Remember that eggs have density too, but because an egg's density is less than salt water's density, you saw floating eggs. On the other hand, an egg is denser than fresh water -- that's why it sunk to the bottom of the container.

Equipped with just a bowl of salt water and a bowl of fresh water, you can test the density of all sorts of ingredients in your kitchen. Do you think a mushroom would float in both liquids? What about a block of cheese? You can even bring out the eggs again -- what do you think would happen if you tried a hard boiled egg instead of a raw one? Keep guessing and testing like a real scientist!

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Floating Egg Experiment

What happens when you toss a coin in water? It sinks, doesn’t it? But why does an apple float in water without sinking to the bottom? Some things float while others sink when you put them in water, because of a concept called density.

Sometimes, understanding the theory behind buoyancy and density can be difficult and confusing for little children. In such cases, performing some simple science experiments for kids like the floating egg experiment demonstrates the concept of density to the kids.

Here is a step-by-step guide to performing the floating egg experiment:

Things You Need For The Floating Egg Experiment

Steps To Set-Up The Floating Egg Science Experiment
The Science Behind Floating Egg Density Experiment
You Can Do More With Floating Egg Science Experiment

The floating egg science experiment is a simple and inexpensive way to help kids understand their lessons on density. All you need are some eggs and saltwater.

Here is a list of things you’ll need to perform the experiment:

2 Eggs (ensure they are the freshest eggs possible)
2 large glasses
2 – 3 cups of water

Steps To Set Up The Floating Egg Science Experiment

Ready for an egg-citing adventure? Then, follow these instructions to perform the floating egg density experiment:

Pour water into each of the glasses until they are about ¾ full.
Add the ½ cup of salt into one glass of water and stir till it is completely dissolved.
Add one of the eggs to the glass with plain water and see what happens. The egg will sink to the bottom.
Now add the second egg into the glass with the salt solution. And voila! You have a floating egg.

The Science Behind The Floating Egg Density Experiment

So, why did the egg float in the salty water, while it sank to the bottom of the glass with plain water? Let’s learn about it by understanding the science behind the floating egg experiment.

Why does the egg float in saltwater?

The egg has a lower density than the saltwater. Since the egg is lighter than the salt solution, it floats in the salty water.

Have you ever wondered why things and even humans float on the Dead Sea? It’s simple, density! The Dead Sea has an extremely high concentration of mineral salts, which increases its density. The water is so dense that even the human body is lighter than it, which makes it float.

Why does the egg sink to the bottom of the glass with plain water?

An egg has a higher density than plain water, which is why it sinks in the glass with plain water.

What is density and buoyancy?

Density is defined as the mass of a particular substance per unit volume. The relative lightness, or ability of a substance to float or rise on a liquid, is called buoyancy. Buoyancy is also the upward pressure or force exerted by a fluid, which causes an object immersed in the liquid to rise or move upwards. The buoyant force is directly proportional to the density of the liquid in which the object is immersed.

You Can Do More With The Floating Egg Science Experiment

It’s time to rack your little scientist’s brain. What else can you use to perform the floating egg experiment?

Instead of salt, use sugar and see if the egg floats in that solution.
Can the egg float in other liquids like milk, oil or even warm water?
Try the experiment with a hard boiled egg and see if it floats in water.

Check our kids learning section for more experiments, activities and other learning resources.

Frequently Asked Questions On The Floating Egg Experiment

What do you learn from the floating egg science experiment.

The floating egg science experiment is a great way to understand the concepts of density and buoyancy. Additionally, it teaches us that objects with lower density float, while those with higher density sink.

What do you need to perform the floating egg density experiment?

The floating egg experiment needs very few ingredients, all of which can be easily found in our kitchens. You’ll need water, salt, eggs and glasses to perform the experiment.

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Floating Egg Experiment

March 10, 2016 by OneMommy

If you’ve ever been to the ocean, you know that you can float in the salty water much easier than you can in pool water.

This simple floating egg experiment is perfect for explaining this phenomenon to kids.

It would be a fun science activity to go along with making a rubber egg .

In this activity you will be making an egg float in salt water.

Afterwards you can learn how to remove the salt from the water in this DIY solar still for water activity.

Materials Needed:

Clear Container (big enough to float an egg)

To begin this egg experiment, fill your clear container with enough tap water to completely cover the egg.

Hand your child the egg and ask them to predict whether the egg will float or sink.

Then carefully place the egg in the water. (A fresh egg will sink; older eggs may float a bit.)

If your child has been to the ocean, this is the perfect time to discuss how much easier it is to float in the salty water.

Ask your child to predict how much salt you will need to add to the water to get the egg to float.

Now remove the egg from the tap water and stir in one teaspoon of salt.

Replace the egg and observe what happens.

If they egg still sinks, repeat the process.

Continue doing this until your egg floats.

The amount of salt needed will depend on the size of your container and how much water you are using. It took 3 teaspoons of salt to get our egg to float in our jelly jar.

When you’re finished, use your egg in the egg drop STEM activity .

Why Does an Egg Float in Saltwater

The egg sank in the fresh water and floated in the salt water because of density.

Density is a measure of mass per unit of volume. Generally speaking, objects that are heavy and compact are higher in density.

The more salt you add to the water, the more mass you add to it, making the salt water denser. Because the salt water is saturated with salt particles it is better able to hold the egg up.

Extensions for the Egg Floating Experiment

Once you’ve succeeded in getting your egg to float in salt water, you can take the learning further with these ideas.

Allow your child to experiment with different liquids. Will the egg float in sugar water or seltzer water?
What other objects can you get to float in the salt water? Try using a variety of small toys, such as Lego figures to see if you can get them to float.

I’m looking forward to the next time I can test out my floating abilities in the ocean.

Until then, this simple floating egg experiment is a great way to introduce density to the kids.

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Floating Egg Science Experiment

Here are the steps to perform the experiment:

Materials needed:

A glass or container

Instructions

Fill the glass or container with water, leaving some space at the top.

Gently place the egg in the water. The egg should sink to the bottom.

Take the egg out of the water.

Start adding salt to the water, a tablespoon at a time, and stir until the salt dissolves.

Place the egg back in the water after each addition of salt and observe what happens.

Keep adding salt until the egg floats to the surface and remains there.

Explanation

The density of water increases as salt is added to it, making the water denser (more molecules per square inch). When the egg is placed in the plain water, it sinks to the bottom because the density of the egg is greater than that of the water. However, as salt is added, the water becomes denser than the egg, causing the egg to float to the surface.

This experiment illustrates the concept of buoyancy and the Archimedes' principle, which states that the buoyant force on an object is equal to the weight of the water displaced by the object. The egg floats because it displaces a volume of water that weighs more than the egg.

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Enjoy fun science experiments for kids that feature awesome hands-on projects and activities that help bring the exciting world of science to life.

Make an Egg Float in Salt Water

An egg sinks to the bottom if you drop it into a glass of ordinary drinking water but what happens if you add salt? The results are very interesting and can teach you some fun facts about density.

Salt water is denser than ordinary tap water, the denser the liquid the easier it is for an object to float in it. When you lower the egg into the liquid it drops through the normal tap water until it reaches the salty water, at this point the water is dense enough for the egg to float. If you were careful when you added the tap water to the salt water, they will not have mixed, enabling the egg to amazingly float in the middle of the glass.

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Simple Science Experiments: Floating Egg Experiment

March 18, 2020 by Selena Robinson 4 Comments

Sharing is caring!

It’s time for another one of our simple science experiments !

This time, we’re learning about salinity and floating with a simple floating egg experiment .

My boys are entering first and second grade, respectively.

These are excellent ages to introduce science experiments – especially ones that are low-prep, inexpensive, and simple to do, right?

Easy Floating Egg Science Experiment for Kids

Check out how we learned about salinity by making an egg float!

This would also be a great science lab for small groups or science centers.

This easy Floating Egg Experiment is a neat way to teach kids about salinity and how it affects weight!

Simple Science Experiment: Floating Egg Experiment

Like all of our science experiments, this one is super easy and requires absolutely no scientific expertise.

To complete this easy science activity, you’ll need the following:

Clear glass

We started by cracking open the Usborne First Encyclopedia of Science . (This is an affiliate link .)

It’s an excellent, hands-on introduction to scientific concepts for kids in grades 1-4.

Simple Science Experiments: Make an Egg Float!

The boys and I read the section about floating together.

We learned that there are places on Earth where water is so salty you can actually read a newspaper while you float along!

In the book, we read the instructions to learn how to recreate the same type of environment that allows human beings to float in salty water.

Then, we were off and running!

We gathered the supplies and got to work.

We poured each glass half full of water.

Then we added 10 teaspoons of salt to one of the glasses.

(Don’t put any salt in the other glass of water.)

When we placed an egg into the glass that didn’t have salt in it, the egg sank right to the bottom like normal.

But when we added an egg to the glass filled with salty water, it floated right to the top.

The kids got a kick out of watching me push it down, only to see it pop right back up!

Easy Floating Egg Experiment - Look! We're Learning!

And that’s how salinity works! Salty water is denser (heavier) than plain water.

So heavy, in fact, that it can support the weight of heavier objects like an egg.

This entire floating egg experiment took about 10 minutes from start to finish.

So if you’re looking for a super quick science experiment, this one’s perfect!

This easy floating egg science experiment is so fun for kids who are learning about salinity! Great for science at home too!

Stop by to see our other science learning ideas!

$Study the properties of light with this simple light refraction experiment!$

August 31, 2015 at 8:40 am

Aren’t those Usbourne books great? I break mine out all the time. This is such a fun, simple experiment. Weren’t your boys surprised they could actually make the egg float? My kids were amazed!

[…] Look We’re Learning – Floating Egg Experiment […]

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The floating egg {hands-on density experiment}

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Science Experiment: The Floating Egg

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Taking it one step further

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