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Fire Science Exam 1
Fire Science Terms and Definitions
23
Other
Undergraduate 4
02/20/2010

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Term
Backdraft
Definition
Type of explosion caused by the sudden influx of air into a mixture of gases, which have been heated above ignition temperature of at least one of them
Term
Combustion
Definition
A chemical reaction that releases energy as heat and usually light (referred to being on fire)
Term
Fire Triangle
Definition
Fuel, Energy, Oxidizer
Term
Flashover
Definition
Fuels over an entire area or in a room reach their ignition temperature at almost the same time
Term
Fire Tetrahydron
Definition
Fuel, Energy, Oxidizer, Chemical Chain Reaction
Term
Conduction
Definition
Transfer of heat through a medium without visible motion
Term
Convection
Definition
Transfer of heat through a circulating medium, such as liquids and gases
Term
Radiation
Definition
Transfer of heat by wavelengths of energy
Term
Flame Impingement
Definition
Touching the flame to the burners
Term
Physical States of Fuel
Definition
Solid, Liquid, Gas
Term
Boiling Point
Definition
Temperature of a substance where the rate of evaporation exceeds the rate of condensation
Term
Explosive Limits
Definition
Percentage of a substance in air that will burn once its ignited
Term
Ignition Temperature
Definition
Minimum temperature to which a fuel in air must be heated in order to start self sustained combustion independent of the heating source
Term
Fire Point
Definition
Temperature at which a liquid fuel will produce vapors sufficient to support combustion once ignited. Usually a few degrees above flashpoint
Term
Flash Point
Definition
Minimum temperature at which a liquid fuel gives off sufficient vapors to form an ignitable mixture with the air near the surface. At this temperature, ignitable vapors will flash, but will not continue to burn
Term
Class A Fire
Definition
Ordinary combustibles
Term
Class B Fire
Definition
Flammable Liquids
Term
Class C Fire
Definition
Energized Electrical Devices/Equipment Fire
Term
Class D Fire
Definition
Combustible Metals
Term
Class K Fire
Definition
Cooking Materials Fire
Term
BTU
Definition
British Thermal Unit, Amount of heat needed to raise the temperature of one pound of water one degree fahrenheit
Term
Pyrolisis
Definition
Available moisture is cooked off and then the solid fuel molecules undergo thermal decomposition and become fuel gases without passing through an observable liquid phase.
Term
Vaporization
Definition
normal process of solid to liquid to gas
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