How To Make A Homemade Bouncy Ball Made From An Egg

Making an egg bounce is a fun way to learn how acid breaks down different substances. According to National Geographic Kids, an eggshell contains calcium, which makes it hard. There is a thin membrane underneath the shell that maintains the egg's shape. When the acid in vinegar dissolves the calcium shell, the membrane stretches resulting in a "rubbery" effect. With a few household items you can entertain and impress others with your "special" ability to make a bouncing egg.

Step 1

Place a cool, hard-boiled egg in the jar. Be sure not to crack the shell.

Step 2

Pour vinegar in the jar until the egg is covered. Place the lid on the jar and twist once. Do not secure the lid too tightly.

Step 3

Let the egg sit in the vinegar for two days until the shell has completely dissolved.

Step 4

Remove the egg from the jar and rinse it in cool water.

Step 5

Place the egg on a paper towel and let it dry. The egg will have a rubbery texture and you will be able to bounce it softly on a table or counter top. Do not attempt to bounce the egg from a height of more than one or two feet as the membrane will break.