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Essentials of Fire 2
Fire Behavior
Question | Answer |
---|---|
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 |