Fire Tornado
Materials: ★★★ Requires materials not commonly found in school laboratories
Difficulty: ★★☆ Can be done by science teachers
Safety: ★★★ Only to be attempted with adequate safety procedures and trained staff
Categories: Combustion, Global Systems, Weather and Climate, Science Shows
Alternative titles: Spinning Fire Column
Summary
This dramatic demonstration shows how a spinning column of fire can be created using a rotating screen cylinder and a flame source. It models the dangerous fire tornadoes that occur in extreme wildfires when hot air updrafts combine with swirling winds.
Procedure
- Roll a metal screen into a cylinder 2.5–3 feet tall, securing it with wire or staples.
- Place the cylinder upright on a rotating tray (Lazy Susan), ensuring it is centered.
- Set a small glass dish with pieces of sponge in the middle of the tray, ideally on a heat-resistant base.
- Soak the sponge pieces thoroughly with lighter fluid.
- Put on safety glasses and light the fire. Spin the tray gently without the screen to observe normal flames. Extinguish with a plate.
- Relight the fire, place the screen cylinder over it, and spin the tray. The rising hot air will twist into a fire tornado inside the screen.
- Remove the screen and extinguish the fire when finished.
Links
Fire Tornado Experiment (Physics) - BeardedScienceGuy:
How to Make a Fire Tornado - Cool Science Demo - TheSpanglerEffect:
📄 Fire Tornado - Steve Spangler: https://stevespangler.com/experiments/fire-tornado/
Variations
- Experiment with different mesh sizes or thicknesses of screen wire to see how the tornado shape changes.
- Try using a record player turntable as the rotating platform.
Safety Precautions
- TEACHERS ONLY – This demonstration should only be performed by trained science demonstrators.
- Always wear safety glasses when handling fire.
- Keep a fire extinguisher nearby at all times.
- Perform in a well-ventilated area away from flammable materials.
- Never allow students or untrained individuals to handle lighter fluid or the flame.
Questions to Consider
- Why does the fire not form a tornado without the screen? (The screen transfers angular momentum to the rising air, giving it a spin.)
- What natural conditions cause fire tornadoes in wildfires? (Strong updrafts of hot air combined with swirling winds through trees and terrain.)
- Why must the screen cylinder be centered on the tray? (If off-center, the screen wobbles and the tornado effect fails.)
- How does this model help firefighters understand real fire behavior? (It shows how airflow and heat can combine to create dangerous spinning fire columns.)