Kindergarten kids are naturally curious, which makes this the perfect age for introducing science. The Egg Sink or Float Experiment is simple, but kids will love the results, and you’ll love how easy it is to set up. Kids will learn about density and have a blast at the same time!

Egg Sink or Float Experiment

There are lots of fun science experiments kids should try including:

• Flower Changing Color before your Eyes Flower Science Experiment
• Or this beautiful and amazing Oil & Water Science Experiment
• A simple, but fun Glitter Volcano Science Experiment
• Amazing Science Experiments for all year in this Month by Month Science Experiments

Kindergarten kids will be fascinated how salt makes an egg float. Use this opportunity to talk about density and why salt keeps things afloat! You’ll need a few things for this egg floating experiment:

• 2 eggs
• 2 jars
• Salt

First, heat one jar of water so that it’s easier to mix the salt into it. This will save you time, but don’t let the kids touch the jar when it’s hot. If you live near the ocean, you can just use seawater as well for this experiment, but it will look dirty. Our salt jar has a pink tint to it because we used Himalayan salt, which is pink. If you use regular table salt, the saltwater will look whiter.

Ask the kids if they think the eggs will float in regular water. Ask if they think the eggs will float in salt water. 

Test an egg in each jar. The kids will likely be very surprised that the egg floats in one solution and not the other! Prepare to answer numerous questions about density and why this happens.

Science Behind the Egg Sink or Float Experiment

This Egg Sink or Float Experiment is all about density. Saltwater is denser than tap water, and denser than an egg. This means that in regular water, the egg will sink, because it is denser than the water. But in the saltwater, the egg is less dense, so it floats to the top. You can use this time to ask kids what other things might be less or more dense than salt water. Experiment with other items in your classroom or home for a full lesson on density.