cart Shopping Cart cart(0)

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

Instructions

 
  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
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!
 
Join our newsletter for more science teaching thoughts & ideas

Join the Fizzics newsletter

Back to force & movement experiments
 

>100 Free Science Experiments on this site!

Coloured shadows
  • Experiments to colour your class!
  • Easy & fun
read more
 
skeleton and student
  • Make fake blood & more!
  • Biology made simple
read more
 
electricity experiments
  • Circuit science for kids
  • Cheap materials found easily
read more
 
Sugar and skittles dissolving in water experiment
  • Creative chemical concoctions!
  • Safe and engaging for kids
read more

School Science Visits: 

  • Highly engaging & curriculum-linked
  • Additional Teacher Support Resources
  • Professional visits in-class or via video conference
  • Both Primary School & High School science incursions
Call 1300 856 828 or use this form to discuss or make a show booking for your school!

Email updates

Signup to our monthly email Learn more
 

Contact us

1300 856 828
info@fizzicseducation.com.au

PO Box 272
Winston Hills, NSW, 2153, Australia
 
facebookgoogle plustwitter
linkedin youtube   ico6 pinterest