Combustion of a thermally isolated material initiated by an internal chemical or biological reaction producing enough heat to cause ignition.

Rapid combustion and/or explosion of unburned gases trapped at some distance from the main fire front. Usually occurs only in poorly ventilated topography.

A number used to indicate relative (not actual) rate of spread.

A planned, systematic procedure for collecting, recording, and evaluating prefire and fire management intelligence data for a given planning unit or preattack block. The planning phase is usually followed by a construction and development program integrated with other resources and activities. 

A course developed by an interagency, all-hazard subject matter expert group containing the same learning objectives and content as an NWCG developed course. Interchangeable course do not require equivalency determination by a using agency and may have multiple course codes and/or numbers. These courses will be incorporated into IQCS/IQS and credit will be given for the NWCG course. 

A map showing location of supplies of water readily available for pumps, tanks, trucks, camp use, etc.

The reduction in forest floor thickness due to consumption by fire.

A situation in which a tree is lodged in another, preventing it from falling to the ground.

The dispatch center actively supporting an incident and the resources assigned or a resource who is temporarily transferred for official action i.e. details, temporary duty station, etc.

Five-minute test used to predict a person's ability to take in, transport, and use oxygen (aerobic capacity), the most important factor limiting the ability to perform arduous work.