The amount of heat flowing through a given area in a given time, usually expressed as calories/square centimeter/second.

The physical location of a resource when not on assignment.

A term used to describe the consistency and viscosity of low expansion foam as the combination of drain time and expansion.

A factor usually on a scale of 1 to 100 which represents a relative rate of forward spread for a specific fuel condition and fixed weather conditions (or fuel model). Factors can be used as multipliers, arguments for entering tables, or provide a ratio of values between two fuels. 

Centrifugal pump with a single impeller.

A motor-driven vehicle, or group of vehicles, designed and constructed for the purpose of fighting fires. May be of different types such as engines, water tenders, ladder trucks, etc.

A group of incident personnel that the Incident Commander or Unified Command assigns to support the command function at an ICP. Command staff often include a PIO, a Safety Officer, and a Liaison Officer, who have assistants as necessary. Additional positions may be needed, depending on the incident.

Prominent ridgeline separating river or creek drainages. Usually has numerous smaller ridges (spur) extending outward from both sides.

Area in which smoke from outside sources is intolerable, for reasons such as heavy population, existing air pollution, or intensive recreation or tourist use.

Fire of known cause that cannot be properly classified into any of the eight standard causes of fires.