This easy to set up salt water density experiment is a cool variation of the classic sink or float experiment. What will happen to the egg in salt water? Will an egg float or sink in salty water? There are so many questions to ask and predictions to make with this easy saltwater density science activity. Make sure to check out all our classic science experiments for more great ideas!

SIMPLE SALT WATER DENSITY EXPERIMENT FOR KIDS!

Simple saltwater density experiment with floating egg for kids

THE DENSITY OF SALT WATER

Get ready to add this simple salt water density experiment to your preschool science lesson plans this season. If you want to learn about why objects float in salt, or maybe they don’t, let’s dig in.  While you’re at it, make sure to check out these other fun water experiments.

Our science activities and experiments are designed with you, the parent or teacher, in mind!  Easy to set up, quick to do, most activities will take only 15 to 30 minutes to complete and are heaps of fun!  Plus, our supplies lists usually contain only free or cheap materials you can source from home!

 

SALT WATER DENSITY EXPERIMENT

Let’s get right to investigating what adding salt water to fresh water does with this fun ocean science activity. Head to the kitchen, open the pantry and be prepared to get a little salty. And if you are curious about the rubber egg experiment in the video, click here.

This salt water experiment asks the question:  How does salt affect the density of water?

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YOU WILL NEED:

  • 2 Tall glasses big enough to hold an egg
  • Warm water
  • Salt

SALT WATER DENSITY SET UP:

STEP 1:  Start by filling one glass about 2/3 of the way full with water. Ask the kids what will happen if you carefully drop an egg into the glass of water. Now go ahead and do it!

 

STEP 2:  In the other glass, fill to the same height with water. Now stir in 3 tablespoons of salt. Mix well to dissolve the salt! Ask the kids what they think will happen this time and demonstrate!

The second egg should float due to the change in density of the water!

 

SALT WATER DENSITY IN THE CLASSROOM

Kids can easily experiment with different objects from around the room. We love sink/float style experiments for encouraging predictions!

Small plastic items will work best with the measurements of salt and water provided. If the item still sinks in the saltwater, ask the kids what they think! Should they add more salt? Have each kid contribute an item to the experiment!

THE SIMPLE SCIENCE OF DENSITY 

This is a great experiment to add to your ocean science lesson plans because the ocean is salty!

So many great saltwater density questions:

  • Do you float better in salt water?
  • What about some of the biggest mammals on earth that float easily in the ocean?
  • Does the density of the saltwater play a role?

Why is the ocean salty? The simple answer is that the salt comes from the rocks on the land that has been broken down by erosion and is carries by streams to the ocean.

saltwater density science experiment with eggs

What is density?

Big items that feel light, like a ping pong ball, we would say are less dense, than smaller items that feel heavy, like a gold ring.  When added to water, objects that are denser than water sink and those that are less dense than water float. Hollow things often float too as air is less dense than water.

You can experiment with many objects that sink and float in water, but what happens when you add salt to the water? Can you change whether the object, like the egg, still sinks or not?

How does salt change the density of water?

Adding salt to water makes the water denser.  As the salt dissolves in the water, it adds mass (more weight to the water).   This makes the water denser and thus allows more objects to float on the surface that would sink in fresh water.

YOU MAY ALSO LIKE: Ice Melting Experiments With Salt

Do objects float better in saltwater or freshwater?

What other items can you find to test? In general, most items will float in this saltwater experiment even if they sink in freshwater. Just look at the egg!

CHECK OUT MORE FUN SCIENCE IDEAS

Weather Preschool Activities

Classic Science Activities

Playful Learning Preschool Activities

Rubber Egg Experiment

Simple Solids Dissolving Experiment

SIMPLE SALT WATER DENSITY EXPERIMENT FOR KIDS!

Discover more fun and easy science & STEM activities right here. Click on the link or on the image below.

Best ever STEM and science activities for kids.

Looking for easy to print activities, and inexpensive science experiments? 

We have you covered…

Click below to get your quick and easy science activities. 

 

15 Comments

  1. When I click the link to go to your blog from my email, a virus (weird website) keeps popping up. I like your blog. But you may want to check into the virus.

  2. I think Liam’s explanation of water density is perfect – smart kid! These projects are a perfect way to *show* kids the difference, instead of just trying to explain it to them (like you said, nearly impossibly for preschoolers!)

  3. Thanks Emma! He’s a smart cookie and likes to see things too understand! Not big on listening a whole bunch just yet 😉

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