Egg Flotation Science Fair Project Essay

  • Salt
  • 2 clear containers
  • Measuring spoons
  • Stirring spoon
  • Water
  • 2 raw eggs
  1. To begin your floating eggs experiment, fill your two containers with water. Make sure the amounts are equal. When you're doing a comparing experiment like this, all the variables, or factors that make up the project, should be the same -- except one (in this case, salt water instead of fresh water).
  2. Use the measuring spoons to pour seven tablespoons of salt in the first container of water. Do not put any salt in the second container.
  3. Stir the container of water until the salt is completely dissolved. This may take a couple of minutes.
  4. Gently place one raw egg in each container.
  5. Watch the eggs for a few seconds. What happens?

The egg should float in salt water, but not in fresh water.

The key to this experiment is density. Density deals with how closely packed together a substance is. You can see density in your food. Imagine you have two bowls that are the same size. In one bowl, you have a salad, but the other one is full of a pot pie. Even though each bowl is filled with food, the pot pie is much denser because the ingredients are smooshed closer together than a light salad of lettuce and just a few vegetables.

In the same way, salt water is denser than fresh water. The molecules are packed tighter, and this density allows an egg to float on the water's surface. Remember that eggs have density too, but because an egg's density is less than salt water's density, you saw floating eggs. On the other hand, an egg is denser than fresh water -- that's why it sunk to the bottom of the container.

Equipped with just a bowl of salt water and a bowl of fresh water, you can test the density of all sorts of ingredients in your kitchen. Do you think a mushroom would float in both liquids? What about a block of cheese? You can even bring out the eggs again -- what do you think would happen if you tried a hard boiled egg instead of a raw one? Keep guessing and testing like a real scientist!

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Here’s another simple science experiment that you can do in less than 5 minutes with items you likely already have in your kitchen. Enjoy!

Watch the Floating Egg Science Experiment

Floating Egg Science Experiment

Supplies Needed for the Floating Egg Science Experiment

  • 2 Eggs
  • 2 Tall Drinking Glass
  • Salt
  • Water

Floating Egg Science Experiment Instructions

Step 1 – Fill a tall drinking glass about 3/4 full of water

Step 2 – Place the egg into the glass of watch and watch it sink…

But this is the Floating Egg Experiment, right?

Step 3 – Fill another tall drinking glass about 3/4 full of water

Step 4 – Add 3 Tablespoons of Salt and stir until combined

Step 5 – Place the egg into the glass and watch it float

How Does the Floating Egg  Science Experiment Work

The egg will sink in regular tap water because the density of the water is less than the density of the egg itself. Adding sale to the water increases it’s density making it more dense than the egg. Therefore the egg will float in the salt water.

I hope you enjoyed the experiment.  Here’s some printable instructions.

Floating Egg Science Experiment

Items Needed

  • Egg
  • Salt
  • Water
  • Drinking Glass


  1. Fill a tall drinking glass about 3/4 full of water
  2. Place the egg into the glass of watch and watch it sink
  3. Fill another tall drinking glass about 3/4 full of water
  4. Add 3 Tablespoons of Salt and stir until combined
  5. Place the egg into the glass and watch it float

Filed Under: Food Science, Science Experiments

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