Geometric bubble films... make a cube-shaped bubble! | Fizzics Education

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# Bubble Geometry

### You will need:

• Four Pipe cleaners
• Strong Bubble mix
• Deep bucket
• Somewhere you can get wet!

1

Connect pipe cleaners together to form a cube … i.e. 6 sides.

First fold one of the pipe cleaners into a square.

2

Now fold another of the pipe cleaners into another square and chop one of the other pipe cleaners into 3 parts. Leave one pipe cleaner untouched at this point.

3

Wind each of the short pipe cleaner pieces onto the corners of the 2 squares made.

4

Begin to connect the squares together to form the cube.

5

Finish off the cube with the final pipe cleaner and leave a small amount hanging off the cube to act as a handle. You can straighten up the frame later.

6

Carefully pour the bubble mix down the sides of the bucket to avoid making small bubbles.

Dip the cube into the bubble mix and carefully withdraw it a couple of times. Can you make a cube-shaped bubble form on the inside of the pipe cleaner frame?

7

Try making tetrahedron (4 sides), a octahedron (8 sides), and a dodecahedron (12 sides)!

Does the bubble shape match the shape of each frame… why?

8

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### Why Does This Happen?

Bubble films are stretchy… scientists call this ‘stretch’ surface tension. As bubbles are stretchy, they always try to shrink into a sphere shape, minimising surface area.

Dipping the frame into the bubble mix traps air inside the frame. The bubble inside the frame tries to form a sphere but the bubble films connecting to the frames pull on the bubble on the inside. This creates a bubble with the same shape as the frame.

### Variable to test

More on variable testing here

• Try different mixtures of bubble mix
• How big can you make the cube before the bubbles don’t work?