What does an inverted cone shape indicate in a fire scene?

An inverted cone shape at a fire scene is indicative of heat and flames rising and spreading outwards, suggesting that the heat was closer to the ground. This shape is often associated with the presence of ignitable liquids or accelerants, as these materials can create a distinct burn pattern characterized by a narrow base and wider patterns at the top. This pattern visually represents how the fire's heat and gases lay down over the area, supporting the idea that significant heat was concentrated near the ground before rising.

This shape may not typically represent a fire that has been completely extinguished, which would not show any active burn patterns. Similarly, while a high ceiling fire could contribute to the pattern seen, it does not directly relate to the inverted cone characteristic. Rapid spread without containment is also a possibility in different fire scenarios but does not specifically describe the inverted cone shape's relationship to heat distribution and ignitable liquids.