new company officer chapter 11.2 fire Flashcards Preview

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Flashcards in new company officer chapter 11.2 fire Deck (32)
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a room or space within a building or structure that is enclosed on all sides at the top and bottom.

compartment p. 307


form of energy associated with the motion of atoms or molecules and capable of being transmitted through solid and fluid media by conduction, through fluid media by convention, and through empty space by radiation

heat p. 307


transfer of heat by the movement of heated fluids or gases, usually in an upward direction

convection p. 307


transmission or transfer of heat energy from one body to another at a lower temperature through intervening space by electromagnetic waves, radio waves, or x rays

radiation p. 307


physical flow or transfer of heat energy from one body to another through direct contact or an intervening medium for the point where the heat is produced to another location or from a region of high temperature to a region o low temperature.

conduction p. 307


the greater the temperature difference between the objects, the ____ _____ the transfer rate

more rapid p. 307


what are the three methods of heat transfer

conduction, convection, radiation p 307


the spread of fire is controlled by

its environment p. 307


once heat levels rise to a degree in which those objects are the same temperature, radiant heat energy is _________

reflected back. p. 307


fires that are limited by the available oxygen supply is said to be

ventilation controlled p. 308


when sufficient oxygen is available, fire development is controlled by the fuel's characteristics and configuration. Under these conditions the fire is said to be

fuel controlled p. 308


thermal layering of gases is also called

heat stratification p.308


the tendency of gases to form into layer according to temperature.

heat stratification or thermal layering p.308


as the volume and temperature of the hot gas layer increases, what does the pressure do?

increases p 308


the interface of the hot and cooler gas layers at the opening is commonly referred to as

the neutral plane p.309


moment when a mixture of fuel and oxygen encounters an external heat (ignition) source with sufficient heat energy to start the combustion reaction.

piloted ignition p. 309


minimum temperature to which a fuel (other than a liquid) in the air must be heated in order to start self sustained combustion, no external ignition source is required.

auto ignition temperature. p. 309


this occurs when all exposed combustible surfaces and objects within a compartment have been heated to their ignition temperature and ignite almost simultaneously.

flashover p. 309


flashover represents a transition from the growth stage to what stage

fully developed stage p. 310


what two factors determine whether a compartment fire will progress to flashover

the fuel must generate enough heat energy to develop flashover conditions and the second is ventilation. p. 310


most fires that grow beyond the incipient stage become

ventilation controlled. p. 310


what influences ventilation

the size, number, and locations of opening as well as the velocity of air being exchanged. p. 310


this is a condition in which the unburned fire gases that have accumulated at the top of a compartment ignite and flames propagate through the hot gas layer or across the ceiling.

rollover p. 311


this is a significant indicator of impending flashover

rollover p. 311


rollover may occur during what stage

the growth stage p. 311


rollover generates a tremendous amount of what type of heat

radiant p. 311


backdraft occurs in what stage

decay p. 311


an increase in low level ventilation prior to upper level ventilation can result in what

backdraft p. 311


instantaneous explosion or rapid burning of superheated gases that occurs when oxygen is introduced into an oxygen depleted confined space.

backdraft p. 311


backdraft conditions can develop where

a room, void space, or an entire building. p. 312