Fiery Foam

Foam burning

Scientific name: LPG bubble through soapy water and flammable foam is formed

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Safety

Wear lab goggles and gloves. There is a serious fire risk - a fire extinguisher should be ready. Make sure there is nothing flammable nearby.

Always follow general safety recommendations. Please note that conducting chemistry experiments you must comply with the relevant legal procedures in your country.

Reaction formula

C3H8 + 5O2 → 3CO2 + 4H2O

2C4H10 + 13O2 → 8CO2 + 10H2O

Step-by-step instruction

  1. Pour soapy water into a large beaker or a basin.
  2. Bubble propane-butane mixture (LGP) through soapy water.
  3. When enough foam is formed, ignite it with a burner. You may take some foam and ignite it on your hand.

Scientific background

LPG mainly consists of propane and butane, and they are highly flammable substances. Soapy bubbles are filled with LGP and due to this the foam is flammable. When the foam is ignited on a hand, LPG burns quickly before it can burn a wet hand.

Danger:
Coolness:
Difficulty:

Published on 14 June 2015

  • Fire
  • Heating with fire
  • Explosion
  • Poisoned gas
  • Organic
  • Electricity
  • Solution
  • Oxidation reduction
  • Color change
  • Precipitate
  • Gassing
  • Catalyst