Ignition is defined as the process of initiating combustion.

Ignition is defined as the process of initiating combustion.

• A. The spread of flames through a building
• B. The release of heat energy during burning
• C. The cessation of a fire
• D. Process of initiating combustion

Answer: (D)

Ignition is the moment when a fire starts—the process of heat, fuel, and oxygen coming together with enough energy to begin self-sustaining combustion. That makes the option describing the process of initiating combustion the best match. The other phrases describe different fire behaviors: the spread of flames is about how a fire grows after ignition, the release of heat energy occurs during combustion once flames are present, and the cessation of a fire is extinguishment. For example, bringing a spark to a flammable liquid can raise it to its ignition temperature and initiate combustion.

Ignition is the moment when a fire starts—the process of heat, fuel, and oxygen coming together with enough energy to begin self-sustaining combustion. That makes the option describing the process of initiating combustion the best match. The other phrases describe different fire behaviors: the spread of flames is about how a fire grows after ignition, the release of heat energy occurs during combustion once flames are present, and the cessation of a fire is extinguishment. For example, bringing a spark to a flammable liquid can raise it to its ignition temperature and initiate combustion.