How to Float an Egg in Water

Make an egg float in water.
••• Ablestock.com/AbleStock.com/Getty Images

If you've ever dropped an uncooked egg into a glass of water, you may have noticed that the egg sinks to the bottom of the glass. This happens because the density of the egg is greater than the density of the water. You can teach children about density and how it affects an object's buoyancy with a simple experiment. Once you change the density of the water, the same egg that once sank to the bottom of the glass will float on top of the water.

    Fill a four cup glass measuring cup with 3 cups of cold water.

    Place an uncooked egg into the measuring cup and observe how the egg sinks to the bottom of the cup. Remove the egg from the cup before you continue.

    Pour 1/4 cup of salt into the measuring cup and stir the water with a spoon until the salt dissolves.

    Place the uncooked egg in the water again and observe how the egg floats on the water.

    Things You'll Need

    • 4-cup glass measuring cup
    • 3 cups of cold water
    • Uncooked egg
    • 1/4 cup of salt
    • Spoon

    Tips

    • The egg floats after you added salt to the water because the salt changed the density of the water. While fresh water is less dense than an egg, salt water is denser than an egg.

      If the egg does not float in Step 4, add another tablespoon of salt to the water to increase its density.

Related Articles

List of Ideas for Science Fair Projects for Middle...
Ideas for Science Fair Projects for Fourth Grade
Characteristics of Aquatic Plants
How to Make a Compass
How to Mix Calcium Chloride and Water
How to Dissolve Sodium Bicarbonate
How to Rubberize an Egg
How to Light a Lightbulb With Saltwater
How to Calculate Volume
Kids' Density Experiments With Salt, Water & Eggs
How to Divide Rational Numbers
How to Turn a Glass of Water With Red Dye Back Into...
Science Project Egg Experiments
What Is the Incubation Period for Duck Eggs?
How to Make a Homemade Submarine That Floats & Sinks
Brine Vs. Conductivity
How to Calculate a Circular Area
How to Calculate an Equivalent Fraction
How to Test for Acidity With Litmus Paper
How to Convert Grams to Ounces