Which of the four extinguishment methods is most commonly used by firefighters?

Cooling the burning material is often considered the most commonly used extinguishment method by firefighters because it effectively reduces the temperature of the fire, bringing it below the combustion point. This approach is particularly effective for fires involving flammable materials that can be easily cooled with water or other extinguishing agents. Water is the most common extinguishing agent used in firefighting, as it not only cools the material but also helps to form steam, which can further smother the fire.

This method is advantageous because it is widely applicable across various fire scenarios, including structural fires, vehicle fires, and wildfires, allowing firefighters to quickly and efficiently control the flames. Utilizing cooling as a primary tactic is essential in protecting surrounding structures and preventing the fire from spreading while ensuring the safety of both firefighters and civilians.