A rating of the forward rate of spread of the head of a fire.

A relative number related to the contribution that fire behavior makes to the amount or effort needed to contain a fire in a specified fuel type. Doubling the burning index indicates that twice the effort will be required to contain a fire in that fuel type as was previously required, providing all other parameters are held constant. 

The condition of a fire or part of a fire that has not been slowed by natural barriers or by control measures.

Removing a fire shelter from its case and unfolding it to use as protection against heat, smoke, and burning embers.

Immediate area where a fire shelter has been deployed.

An aluminized cloth tent that offers protection in a fire entrapment situation by reflecting radiant heat and providing a volume of breathable air.

Chemical that inhibits combustion primarily through chemical reactions between products of combustion and the applied chemicals, even after the water component has evaporated. Other chemical effects also may be achieved, such as film-forming and intumescence. 

Maximum water flow rate a fire pump will attain when there are no restrictions at the pump outlet or losses due to friction or head.

Aircraft with pilot used to make trial runs over the target area to check wind, smoke conditions, topography and to lead airtankers to targets and supervise their drops.

The second continuous day of an incident, a regular government employee's normal daily tour of duty is "spot changed" to where the first 8, 9, or 10 hours worked are base hours.