Wax fire
Physics Behind The Reaction
Following the basic rules of the fire triangle, for a reaction to take place three ingredients are required: oxygen, fuel, and heat. In the case of wax melted down, only the top surface has access to oxygen, so the fire progresses slowly. When water is added to the wax, two things happen. Firstly, the water being more dense than wax, sinks to the bottom of the container. Secondly, as burning wax quickly reaches a temperature of well over 200 degrees C, the water instantly vapourises. When water changes from a liquid to a gas, there is more than a thousand-fold increase in volume. The water expands violently, and throws the hot wax layer above it in to the air as small droplets. The wax now has a much bigger surface area exposed to oxygen so combustion takes place very quickly.
For similar reasons, water should never be used to extinguish burning grease or fat, which both behave similarly to wax. Water is ineffective at putting out other flammable liquid fires, but in most liquids (e.g. petrol), the water remains as a liquid, and spreads the fire by allowing the liquid to float and burn on top of it.
Example
http://video.google.com/videoplay?docid=-234893668948735878&q=wax+fire
See also
- Wax boiling Also known as wax burning
- Chip Pan Fire
- Boilover
