Plastic Egg Submarines

Are you looking for some fun ideas to keep the kids occupied this spring and summer?

Kids of all ages love STEM activities.  They tend to be very hands-on, allowing kids to be creative and have fun, all while learning.

Even preschoolers can get in on the fun when it comes to STEM.  Your child will have fun making their very own plastic egg submarine.

Affiliate links have been used below.  See my full disclosure here. 

 Plastic egg activities like this one are lots of fun.

Making these egg submarines with plastic Easter eggs was a huge hit with my preschooler.   

Not only did he have fun experimenting and playing with water, but it was a great activity for the letter “S” in our preschool vehicle activities for the alphabet.

This activity was inspired by this Sink the Easter Egg activity.

Plastic Egg Submarine

Materials Needed:

• Plastic Eggs
• Pom poms, beads, and other small items that fit in the eggs
• Coins
• Clear Tape (optional)
• Game Dice (1-2)

The object of this activity is to figure out how to make your plastic egg sink like a submarine.  (In the fall try our pumpkin sink or float activity.)

I had a collection of beads, pom-poms, pennies and quarters on hand to use to help sink our plastic egg submarines.

We used 4 eggs and rolled a game die to see how many of each object would go into each egg.

Then I asked the preschooler to guess whether or not the submarine would sink or float, and we set each egg in the water.  (If your eggs have holes in the ends, you will want to use a bit of clear tape to cover them.)

We soon discovered that the pom-pom egg floated at the very top of the water.

The one with a few beads was also at the top.

The submarines with pennies and quarters sank part way.

How to Make Plastic Easter Eggs Sink

We tried completely filling one egg with the pom-poms, one with beads, one with pennies, and one with quarters.

Before placing our submarines into the water this time, we put a few of each item (pom-pom, quarter, etc.) into the water.  The preschooler noticed that the pom-pom and some of the beads floated, while the coins sank right away.

We talked briefly about why that may be.

Then we tried our newly filled eggs.

The preschooler was very happy to see the penny and quarter-filled egg submarines sank to the bottom.

When he realized the bead and pom-pom ones were still not sinking, we talked about how the plastic eggs still had air in them, helping them float.

Then we tried filling those spaces with water — success!  The plastic egg subs all sank.  

The preschooler continued filling eggs, watching them sink or float while I prepared lunch.  He asked to continue the play after lunch, too.

Plastic egg submarines are a simple sink and float science activity that your preschooler will love.  

Other STEM activities your child will love:

• Design a Boat That Floats
• Build a Rubber Band Boat
• Cardboard Tube Marble Run
• DIY Geoboard 

Originally published April 22, 2014.