Kitchen Science: How to make an Egg Float!

Introduce your little ones to the magical world of science (while learning about density) with this mini-science experiment that is hands-on and requires items already found in the kitchen.

You’ll need the following:

Salt

Tall drinking glass

an egg

water

This was a great indoor activity for a cold afternoon for my 4 year old. This is what we did:

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First, I asked my son what to fill up a glass with just plain old water. Next, I asked him what he thought would happen if he (gently!) put the egg in? Then, he (obviously misunderstanding!) took the egg and cracked the side and it landed all over the table. So we got another egg and tried again:

IMGP4546Next, we added water to the halfway point of a drinking glass, added 6 tablespoons of salt and gently mixed:

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Next, we slowly (and carefully!) added tap water and filled up the glass. Then, lowered the egg into the glass:

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The egg ended up passing through the water until it reached the saltwater, where it began to float in the middle of the glass!

So what happened? 

Density is a measurement of how much mass something occupies for a given volume. For example, a ball made of cork is less dense than one made of steel.

Salt water is more dense than tap water.

An object that is less dense than a liquid will float.

The egg is more dense than the tap water and sinks while conversely, it floats on the salt  water!