Material First Ignited refers to:

• A. The final material that burns after ignition.
• B. The fuel that is first set on fire by the heat of ignition.
• C. The material that is ignited by smoke.
• D. The material that resists ignition.

Answer: (B)

Material First Ignited is the fuel that reaches its ignition temperature and begins to burn first, due to heat from the ignition source. This initial ignition starts the flame growth in the compartment, as the first fuel exposed to sufficient heat begins to burn and then can transfer heat to other fuels, causing the fire to spread. It isn’t about the final material burning, nor about something ignited by smoke, nor about something that resists ignition. Understanding which material ignites first helps explain how a fire starts and begins to grow.