Which of the following is NOT a component of the fire tetrahedron?

The fire tetrahedron is a model that describes the necessary elements for fire to occur. It includes four components: heat, fuel, oxygen, and a chemical chain reaction.

Heat is essential as it raises the temperature of fuel to its ignition point. Fuel is the combustible material that burns, while oxygen is a critical supporter of combustion that reacts with the fuel. The chemical chain reaction is the process that sustains the fire once it has started, allowing it to spread.

Pressure is not a component of the fire tetrahedron. While it may affect fire behavior in certain situations, such as influencing flame spread or fire intensity, it is not listed among the fundamental elements that create and maintain a fire. Understanding the fire tetrahedron is crucial for fire prevention and suppression strategies, making it important to distinguish which elements are truly necessary for fire.