Fresh eggs sink and older eggs float. Eggs have an air cell that become 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.

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
  • 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. I added about 5 tablespoons then tried it again, adding more and more until the egg floated.

Why does an egg float in salty water?

Objects sink in water when they are more dense than the water. Adding salt increases the density of the water. Once the water is more dense than the egg, the egg floats.

egg floating in salt water

You could also try other objects and see what else you can make float. 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!


The post Make an Egg Float appeared first on Science Experiments for Kids.

Originally posted at Science Sparks