Create fog rings

Create fog rings

Create fog rings

Follow FizzicsEd 150 Science Experiments:

You will need:

Adult supervision

A bin, or bucket.

A piece of vinyl plastic, or table, cloth larger than the bin.

A ratchet strap, gaffer tape or similar.

A knife.

A fog machine and fog liquid.

Create fog rings science experiment - materials needed
1 Create fog rings science experiment - cutting out the bin base

Use the knife to cut a hole out of the base of your bin, no larger than half the diameter of the bin bottom.

2 Create fog rings science experiment - stretching vinyl over the bin

Stretch the table cloth or similar material across the larger opening of the bin. If you can get your hands on some vinyl this is the best material to use.

3 Create fog rings science experiment ratchet strap in place

Secure the vinyl with a strap, or strong tape, to make the bin into a drum.

4 Create fog rings science experiment - adding stage fog to the bin

Fill the bin opening with stage fog.

5 Create fog rings science experiment - vortex rings being made

Hit the drum and watch the fog rings fly!

Why Does This Happen?

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 rings as the slow air on the edge of the hole rushes toward the faster air in the centre 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!

Learn more!

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