What is the term for the portion of a fire that moves most rapidly?

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The term for the portion of a fire that moves most rapidly is known as the fire head. In fire dynamics, the fire head is the leading edge of the fire front where combustion is most vigorous, and the flames are typically more intense and spreading faster compared to other parts of the fire. This is the area where the fire consumes the most fuel, thus exhibiting the highest heat release rate and propagating quickly due to prevailing winds or terrain features. Understanding this aspect of fire behavior is critical for effective firefighting strategies and safety measures, as it helps responders anticipate the direction and intensity of the fire's spread.

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