The quantity of wildland fuel available in a specific area is called fuel:

The term that refers to the quantity of wildland fuel available in a specific area is indeed related to the concept of "volume." In the context of wildland fire behavior, "volume" signifies the amount of combustible materials, such as grass, shrubs, and trees, that can potentially ignite and sustain a fire. The more fuel present in a given area, the higher the potential for intense and prolonged fire behavior.

Understanding fuel volume is critical for fire management and firefighting strategies. It helps determine fire severity, the spread of a fire, and the necessary resources and tactics needed to combat it. It also aids in predicting how a fire will behave under different weather conditions and topography. Effective management practices, such as fuel reduction methods, are often employed to control this volume and mitigate fire risks.