Partly decayed material, such as old wood, in which fire can smolder unless it is carefully mopped up and extinguished. A good receptor for firebrands when dry.

The taking or keeping of a person in custody by legal authority, especially in response to a criminal charge.

Absolute maximum allowable gross weight for an aircraft as established by the manufacturer and approved by the FAA.

According to the American Meteorological Society, in the Northern Hemisphere, a wind that rotates in the counterclockwise direction with increasing height. In fire management usage, in the Northern Hemisphere, a wind that rotates in the counterclockwise direction over a given time period (normally a few hours).

Result of chemical reaction between a metal and its environment (i.e., air, water, and impurities in same).

The relative amount of time a fire burns in the flaming phase of combustion, as compared to smoldering combustion. A ratio of the amount of fuel that is consumed in flaming combustion compared to the amount of fuel consumed during the smoldering phase, in which more of the fuel material is emitted as smoke particles because it is not turned into carbon dioxide and water. 

In a psychrometer, the thermometer not covered with muslin which is used to determine air temperature.

A set of standardized procedures and practices that have been peer-reviewed and have received general acceptance by the profession.

The broad spectrum of activities and organizations providing operations, coordination, and support applied at all levels of government, using both governmental and nongovernmental resources to plan for, respond to, and recover from an incident, regardless of cause, size, or complexity.

All combustible materials below the surface litter, including duff, tree or shrub roots, punky wood, peat, and sawdust, that normally support a glowing combustion without flame.