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Create fog rings

You will need:

  • A bin, bucket or even a plastic cup
  • A piece of vinyl, plastic or table cloth larger than the bin
  • A ratchet strap, gaffer tape or similar
  • A knife (adults please!)
  • A fog machine and fog juice



  1. Cut a hole out of the base of your bin no larger than half the diameter of the bin bottom.
  2. Stretch the table cloth or similar material across the larger opening of the bin.
  3. Secure with a strap or strong tape to make the bin into a drum.
  4. Fill the cut opening with stage fog.
  5. Hit the drum and watch the fog rings fly!

    Vortex rings
Be Amazing Book Front Cover; Ben Newsome, teacher & founder of Fizzics Education. Be Amazing -how to teach science the way primary kids love
Be Amazing!
How to teach science, the way primary kids love

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Why does it work?

A fog machine is used to fill a drum made out of a bin. Hitting the drum forces air out of the hole, with the pressure differences within the air causing an air vortex. The pressure differences are caused due to air slowing down as it rubs on the side of the hole. Areas of 'slow air' tend to move towards areas of 'fast air'... better put; high pressure moves to low pressure. The mathematician Bernoulli found that moving air has less pressure than air that is still... this helps to create the fog ring as the slow air on the edge of the bin hole rushes toward the faster air in the center of the hole. The moving air has momentum and rolls the fog into a ring shape, also known as the vortex you see puffing out of the bin!
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