Bubble Science- How to Make Square Bubbles

This post may contain affiliate links.

Did you know that you can make square bubbles?

Most of us think of bubbles as perfectly round spheres, but with a simple homemade bubble wand and some bubble solution, you can create amazing square bubbles that seem to defy expectations!

This hands-on science activity is a fantastic way for kids to explore surface tension, soap films, geometry, and the science of bubbles. Best of all, it only requires a few inexpensive supplies and can be assembled in minutes.

My kids were completely fascinated by this experiment and spent a long time dipping, lifting, and observing the bubble shapes that formed.

Can You Really Make a Square Bubble?

Yes!

Although individual soap bubbles naturally form spheres, a special cube-shaped bubble wand can create square bubble films and even a small square-shaped bubble in the center of the cube.

This surprising effect happens because of the way soap molecules and water molecules work together to minimize surface area while maintaining the strongest possible structure.

It’s a wonderful demonstration of surface tension in action.

Supplies Needed

• 6 pipe cleaners
• 6 plastic straws
• Large bucket, pot, or deep bowl
• Bubble solution
• Warm water
• Liquid dish soap

Optional:

• Glycerin (for stronger bubbles)
• Food coloring
• Measuring cups

How to Make a Square Bubble Wand

Step 1: Build the Cube Frame

Cut the pipe cleaners and straws in half.

Twist three pipe cleaner pieces together to form a pyramid-like corner.

Repeat until you have four identical sections.

Step 2: Add the Straws

Slide a straw segment onto each pipe cleaner section.

The straws act as rigid sides of the cube while the pipe cleaners allow the corners to connect.

Step 3: Assemble the Cube

Twist the corners together to form a complete cube shape.

This cube will become your square bubble wand.

Make the Bubble Solution

Fill a large bucket or deep bowl with warm water and liquid dish soap.

For stronger, longer-lasting bubbles, add a small amount of glycerin.

A good bubble mixture creates stronger soap films and makes the square bubbles easier to see.

How to Make Square Bubbles

Step 1: Submerge the Cube

Place the entire cube beneath the surface of the bubble solution.

Make sure every side becomes coated with soap film.

Step 2: Lift Slowly

Slowly pull the cube out of the solution.

As the soap films form across the sides of the cube, you’ll begin to notice something incredible happening.

Step 3: Observe the Center Bubble

Inside the cube, a small square-shaped bubble appears in the center.

Look closely at the soap films stretching between the sides of the cube.

This unusual shape is what makes the experiment so fascinating.

Why Do Square Bubbles Form?

At first glance, it seems impossible. After all, soap bubbles are supposed to be round!

Normally, a bubble forms a sphere because a sphere encloses the greatest volume of air with the smallest possible surface area. This minimizes the force of attraction between water molecules and creates the most stable shape.

Inside the cube, however, multiple soap films pull against one another.

The soap films along the edges create the tightest possible groupings, pulling the center bubble into a square shape.

The result is a beautiful example of geometry, physics, and chemistry working together.

The Science of Surface Tension

Surface tension is the force that causes water molecules to stick together.

Soap molecules weaken this attraction slightly, allowing flexible soap films to form.

As the films stretch across the cube frame, they naturally arrange themselves into shapes that use the least amount of energy.

Scientists call these “minimal surfaces.”

The center square bubble forms because the surrounding soap films pull equally from all directions.

STEM Questions to Explore

• What happens if you make a larger cube?
• Can you create square bubbles with different frame shapes?
• What happens when you pop one side?
• Does adding glycerin change the bubble strength?
• Can you build a triangular or pyramid bubble wand?
• Which shape produces the most interesting soap films?

Extend the Learning

Try building a different wand shape:

• Triangle bubble wands
• Pyramid bubble wands
• Hexagon bubble wands
• Giant bubble wands

Compare the soap films that form in each shape and record your observations like a real scientist.

More Bubble Science Activities

If your kids enjoyed making square bubbles, be sure to try:

• Bubble Blower Machine
• Bubble Shooter Toy

Square bubbles are one of the best science demonstrations because they seem impossible at first glance. With a few straws, pipe cleaners, and some bubble solution, kids can explore geometry, chemistry, and physics while having a whole lot of fun.