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Essentials of Fire 2

Fire Behavior

Rapid Chemical reaction that gives off energy and products of combustion Fire
Study of the physical world (chemistry and physics) Physical science-
Capacity to perform work Energy
Transformation of energy from one form to another Work
Energy possessed by a moving object Kinetic energy-
Amount of energy delivered over a given period of time Power
The most common form of energy on earth Heat
Indicator of heat and the measure of the warmth or coldness of an object Temperature
The amount of heat required to raise the temperature of 1 gram of water 1 degree Celsius A calorie-
The amount of heat required to raise the temperature of 1 pound of water 1 degree Fahrenheit British thermal unit-
Relationship between calorie and joule Mechanical equivalent of heat-
True or False--- 1 calorie equals 4.187 joules and a Btu equals 1,055 joules True
Cause of most exposure fires Radiation
2 factors that changes the state of Matter Temperature and Pressure-
Ratio of the mass of a given volume of a liquid compared with the mass of an equal volume of water Specific gravity-
Density of gas or vapor in relation to air Vapor density-
This law states that mass and energy are neither created or destroyed--even after converted from one to another The Law of Conservation of Mass-Energy-
Transformation of matter from one state to another Chemical reaction-
Formation of a chemical bond between oxygen and another element Oxidation
4 components of the Fire Tetrahedron Oxygen (oxidizing agent) , fuel, heat, self-sustained chemical reaction-
Self-sustaining chemical reaction yielding energy Combustion-
The fuel in a combustion reaction is known as Reducing agent-
Chemical decomposition of a substance throuh the action of heat Pyrolysis-
Fire Hazard Properties of Flammable Liquids, Gases, And Volatile Solids--NFPA NFPA 325-
Hazardous Chemicals Data--NFPA NFPA 49-
Total amount (mass) of fuel in a compartment Fuel load or fire load-
The most common source of heat in combustion reactions Chemical heat energy-
Chemical heat energy that occurs when a material increases in temperature without the addition of external heat Self-heating (spontaneous heating)
True or False--The rate at which most chemical reaction occurs does not double with each 18 F increase in the temperature of the reacting materials False
When the amount of fuel available to burn is limited Fuel controlled-
When the amount of oxygen available is limited Ventilation controlled-
Amount of heat energy released over time in a fire Heat release rate (HRR)-
Guide for Fire and Explosion Investigations--NFPA NFPA 921-
Tendency of gases to form into layers according to temperature Thermal layering (heat stratification and thermal balance)-
True or False-- Flameover is distinguished from flashover by its involvement of only the fire gases within a compartment True
Products of combustion that cause central nervous system depression Narcotic or asphyxiant gases-
Most common narcotic gases Carbon monoxide (CO), hydrogen cyanide (HCN) and carbon dioxide (CO2)-
True or False-- Most ignitable liquids have a specific gravity of less than 1 True
Addition of Class A foams sometimes referred to as Wet water
Created by: studyguy1