FT 105 Ch. 3
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Planned and controlled self sustaining chemical reaction between a fuel and oxygen with the evolution of heat and light.
Rapid self sustaining oxidation process that involves heat, light, and smoke in different quantities.
Older three sided model used to describe the necessary requirments for fire.
Four sided model describing heat, fuel, oxygen, and chemical reaction need for combustion.
Molecular fragment possessing at least one upaired electron.
Break down of a solid into gaseous components when heated.
A.K.A Thermal decompostion
Material self heats to its piloted ignition temp. then ignites.
Piloted Ignition Temperature
Ignition temp. of a liquid fuel, when heated it will self ignite.
Unburned products of combustion seen in smoke.
Captured cooler air that replaces the rising heated air surrounding the point of combustion.
Absence of flame with presence of hot materials in the surface where oxygen diffuses into the surface of the fuel.
Strong respiratory irritant produced when polyethylene is heated, or when materials with cellulose smolder.
- Colorless but pungent
- irritating gas givin off during thermal decomposition of materials that contain chlorine.
Colorless, almond odor
20X more toxic than CO
Asphyxiant can be absorbed through skin
Produced from combutsion of natural materials (wool, silk), or materials containing urea.
Can cause asphyxia by eliminating oxygen from confined space.
NO2 and NO
Smoke is a reddish brown color
Can have delayed symptoms
Highly toxic, colorless gas
Disagreeable odor of musty hay
Symptoms delayed several hours from exposure
Produced when freon or refrigerants come into flame contact.
Stoichiometry of Reaction
Proportion of fuel to oxygen and the resulting end products.
Ideal burning situation where there is perfect balance of fuel and oxygen.
Exothermic chemical reaction with flames occuring between a substance and oxygen.
Combustion process where the flames are part of the actual process.
Class A Fire
Extinguished by water.
Class B Fires
Extinguished by removing oxygen supply and cooling.
Class C Fire
Extinguished by cutting of power.
Class D Fire
Extinguish by specific foam mixture for different metals.
Class K Fire
Extinguish by dry or wet chemical depending on sopanification.
Process of chemically converting fatty acid to sopa or foam.
Point in which the 4 components of the fire tetrehedron come together and materials reach there ignition temp.
Fire increases fuel consumption and heat generation.
Fully Developed Stage
Maximum Fuel consumption and heat occurs.
Flames travel up and long uburned gases during fire development.
Sudden event that occurs when all contents of a confined space reach there ignition temperature and ignite simultaneously.
Violent reignition of closed container that has consumed all the oxygen within the container when new oxygen is introduced.
Fire has consumed all available fuel and temperaure begins to decrease.
Used in high rise buildings to provide a safe environment within the structure where persons can be protected from fire.
Temp. difference between inside of a bulding and the outside of the building
Ratio of moisture in a given volume to the amount that volume would contain if saturated.
Law of Latent Heat of Vaporization
Heat that is absorbed when one gram of liquid is transformed into vapor at the boiling point under one atmospheric pressure.
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