Soap Bubble Minimal Surface Area Geometry

30 mins Ages 7-9 Indoor

An engaging, screen-free learning activity that builds real-world creativity and critical thinking for kids aged 7 to 9.

Materials Needed

  • • Craft chenille pipe cleaners (12 stems)
  • • Liquid dish soap (1/2 cup)
  • • Glycerin or light corn syrup (2 tablespoons)
  • • Deep mixing bowl or small bucket (1 unit)
  • • Plastic drinking straw (1 unit)

Pro Tips

  • → Bend pipe cleaners into geometric 3D wireframes: a cube, a pyramid (tetrahedron), and a triangular prism.
  • → When dipped into bubble solution, surface tension pulls the soap film into mathematical minimal-area surfaces, creating a central floating square or bubble inside the 3D frame.
  • → Gently blow through a straw into the center of the frame to capture a cube-shaped bubble.

Safety First

Keep soapy solution away from eyes; wipe slippery floor areas immediately.

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Step-by-Step Instructions

1

Step 1

Twist pipe cleaners together to construct a sturdy 3D wireframe cube measuring 8 cm on each side.

2

Step 2

Twist a second wireframe in the shape of a 3-sided triangular pyramid (tetrahedron).

3

Step 3

Mix 4 cups of water, 1/2 cup of dish soap, and 2 tablespoons of glycerin in a deep bowl.

4

Step 4

Submerge the wireframe cube completely, lift it out gently, and observe the soap film form a small square bubble suspended at the center.

What they are learning

Plateau’s Laws of minimal surfaces Surface tension mathematical equilibrium 3D geometric film geometry