A small amount of alcohol is vaporized inside a large plastic jug and ignited at the opening, producing a dramatic “whoosh” sound and a burst of blue flame.

1. Inspect a 5-gallon plastic jug for cracks, frosting, or damage and replace if flawed.
2. Measure 20–30 mL of isopropyl alcohol into the jug. Recap the alcohol container and move it far from the demonstration area.
3. Lay the jug sideways and swirl it for about 30–60 seconds to coat the interior and allow the alcohol to vaporize.
4. Pour out any excess liquid alcohol and wipe the mouth and outside of the jug.
5. Place the jug upright on the floor behind a safety shield.
6. Dim the room lights.
7. Using a match or wooden splint taped to a meter stick, carefully bring the flame just over or slightly into the jug’s opening.
8. Observe the rapid ignition and the “whoosh” sound as flames burst out and dance inside the jug.
9. After the flame subsides, allow the jug to cool before handling.

The Whoosh Bottle - Imagination Station Toledo:

Whoosh Bottle gone wrong - Lizlodude (this is included to highlight what can go wrong):

📄 Whoosh Bottle - Flinn Scientific: https://www.flinnsci.com/api/library/download/bf2f0d16dd86411ea26eb0cb687dc593?srsltid=AfmBOoqwI0YOb5OGjhTiWb-hWmoR6s5WmgRyNchbW8im7yOy3tqUIpzq

None listed

• Perform only in a well-ventilated room away from smoke detectors and sprinklers.
• Always use a plastic jug, never glass, to avoid shattering from gas expansion.
• Wear safety goggles and ensure all observers also wear eye protection.
• Use a safety shield and keep a fire blanket nearby.
• Keep alcohol containers capped and far from the demonstration area.
• Never use methyl alcohol (methanol) due to extreme volatility and violent combustion.
• Do not add alcohol to a hot jug; allow cooling before repeating.
• Keep ceilings at least 4 feet above the jug to prevent scorching.
• Dispose of excess alcohol safely and rinse the jug before storage.

• Why does swirling the alcohol inside the jug help prepare the demonstration?
• What role does activation energy play in starting the combustion reaction?
• Why does the jug produce a “whoosh” sound instead of a quiet flame?
• Why must glass never be used for this demonstration?