Safety / Survival / Army Field Manuals / AFM 3-05.70
7-1. To build a fire, it helps to understand the basic principles of a fire.
Fuel (in a nongaseous state) does not burn directly. When you apply heat to a
fuel, it produces a gas. This gas, combined with oxygen in the air, burns.
7-2. Understanding the concept of the fire triangle is very important in
correctly constructing and maintaining a fire. The three sides of the triangle
represent air, heat, and fuel. If you remove any of these,
the fire will go out. The correct ratio of these components is very important
for a fire to burn at its greatest capability. The only way to learn this ratio
is to practice.