The neutral plane is most directly associated with:

The neutral plane is primarily associated with thermal layering, which refers to the stratification of heat and smoke in a fire environment. In a compartment fire, the temperatures can vary significantly within the space, leading to layers of differing temperatures. The neutral plane is the level where the pressure is equalized and typically marks the boundary between the hotter, smoke-filled air above and the cooler air below.

Understanding this concept is crucial for firefighters, as the position of the neutral plane can significantly impact visibility, heat exposure, and the overall dynamics of smoke movement during firefighting operations. Effective fireground strategies often depend on recognizing and leveraging the thermal characteristics of a space, including the location of the neutral plane, to make informed decisions about entry, ventilation, and rescue operations.