Final answer:
The elements necessary to create fire in the fire triangle model are fuel, oxygen, and heat.
Step-by-step explanation:
In the fire triangle model, the elements necessary to create fire are fuel, oxygen, and heat.
Fuel is any combustible material that can sustain a fire. It can be characterized by its size, shape, moisture content, quantity, and arrangement.
Oxygen is required for combustion to occur. Air typically contains about 21 percent oxygen, and most fires require at least 16 percent oxygen content to burn.
Heat is responsible for the ignition of fire and is needed to maintain and spread the fire. It allows the fire to dry out and preheat nearby fuel and warm the surrounding air.