Which component of the fire triangle is considered the fuel source?

The fuel source in the fire triangle is indeed the combustible material. The fire triangle is a simple model for understanding the necessary ingredients for most fires and consists of three components: heat, oxygen, and combustible material.

Combustible material refers to any substance that can ignite and burn, such as wood, paper, fabric, or gasoline. These materials provide the necessary organic or chemical components that, when combined with heat and oxygen, can lead to combustion. For a fire to start and continue burning, there must be an adequate amount of combustible material present.

Heat is essential because it raises the temperature of the combustible material to its ignition point, while oxygen supports the combustion process. Smoke, on the other hand, is a byproduct of combustion rather than a component that contributes to the initiation or maintenance of fire. So, it is the combustible material that plays the pivotal role of being the fuel source in the fire triangle.