new company officer chapter 11.2 fire Flashcards
(32 cards)
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
