What are the two main components of the fire triangle?

The two main components of the fire triangle are fuel and heat. The fire triangle is a simple model for understanding the ingredients necessary for most fires. It consists of three elements: fuel, heat, and oxygen.

Fuel refers to any combustible material—solid, liquid, or gas—that can burn. This is the substrate that undergoes combustion when the right conditions are met. Heat is the energy source that raises the material to its ignition temperature, causing it to catch fire. Without heat, even the most combustible materials will not ignite.

While oxygen is an important element for combustion, the focus of the question emphasizes the specific pairing of fuel and heat, which are critical in initiating and maintaining a fire. The incorrect choices do not encapsulate this essential pair effectively, as they either omit a crucial element or focus on aspects not fundamental to the fire triangle model.