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.
How to make an egg float
- A bowl or large glass
- Tap water
- Table salt
- Fresh Egg
- 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.
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 reaction, find out what a leavening 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