“Square bubbles?” – Two experiments with giant soap bubbles

Square bubbles
Square bubbles

When you make soap bubbles, you usually use a round ring. Children then quickly ask whether a square soap bubble would form if this ring were not round.

What you need:

  • shallow dish
  • Bubble suds (water with washing-up liquid without care additives)
  • wire
  • solder
  • soldering iron

Make the new soap bubble rings

In order to be able to make soap bubbles, you need the right rings in which the soapy water can collect. So that your wire frames don’t have any edges that would cause the soap bubbles to burst, you must carefully solder them together.

  1. Bend the wire into the desired shape and cut the appropriate length. Choose a circle, a square and, if you enjoy it, a star as shapes. The molds should lay flat in the tray.
  2. Carefully solder the ends of the wire together. There must not be a gap or an edge.
  3. Now solder a wire in two places that you can use as a handle. The wire should be offset at a small angle to the face of the bubble mold. When the ring is lying flat, the handle should be pointing slightly up but not overhanging the mold surface.

Make square bubbles

As soon as the soldered areas have completely cooled, you can try to make angular soap bubbles.

Every child loves soap bubbles and making the perfect bubble water is quick and easy. 

  1. Pour the soapy water into the shallow bowl.
  2. First place the round mold in the lye and carefully lift it out again.
  3. The soap should now have gathered into a thin sheet in the mold.
  4. Gently wave the shape through the air and watch the bubbles form.
  5. As soon as you have a feeling for the right swing and your soap bubbles work, test the square shape.

No matter what basic shape you use for the soap bubbles, round bubbles will always be created.

explanation for the result

  • The surface tension of the water ensures that the molecules collect in the surface.
  • This tension also ensures that the water always strives for the smallest spread. It wants to contract, so to speak.
  • A certain amount of air is trapped in the soap bubble and does not change until the bubble bursts. As the water contracts it encloses the air with the smallest possible surface area and this is always a spherical shape.
  • If you swing the bubble shapes very slightly so that no bubbles come off, the transition from the given square shape to the sphere can be observed well.

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