By Roger Underwood
Introduction
Anyone who has studied elementary physics, or basic fire science, is familiar with the Fire Triangle. For a fire to occur three things must be present:
- Oxygen, to enable oxidation or combustion (or, in everyday terms “burning”);
- Fuel, which is the substance that burns; and
- Heat, or a source of ignition, to ignite the fuel in the presence of the oxygen.
If any one of these elements is absent, a fire will not occur.
I first remember seeing this demonstrated in a laboratory when I was a high school student. Our physics teacher had a glass container from which all the air had been removed. When a lighted candle was inserted into the vacuum, it immediately went out. No air, which means no oxygen, meant no fire. A lesson never to be forgotten.
In fact, there are two Fire Triangles, and both must be understood if bushfires are to be effectively managed and bushfire damage is to be minimised. They are the Classic Fire Triangle, and the Bushfire Triangle. Continue reading “Fire Triangles”