Shared Flashcard Set

Details

CH.3 FIRE BEHAVIOR
CSM FIRE ACADEMY MIDTERM REVIEW
28
Other
Not Applicable
10/08/2010

Additional Other Flashcards

 


 

Cards

Term
Autoignition Temperature
Definition
Same as ignition temperature except that no external ignition source is required for ignition because the material itself has been heated to ignition temperature.
Term
Backdraft
Definition
Instantaneous explosion or rapid burning of superheated gases that occurs when oxygen is introduced into an oxygen-depleted confined space. The stalled combustion resumes with explosive force. It may occur because of inadequate or improper ventilation procedures.
Term
Boiling Liquid Expanding Vapor Explosion (BLEVE)
Definition
Rapid vaporization of a liquid stored under pressure upon release to the atmosphere following major failure of its containing vessel. The failure of the containing vessel is the result of over-pressurization caused by an external heat source causing the vessel to explode into two or more pieces when the temperature of the liquid is well above its boiling point at normal atmospheric pressure.
Term
Carbon Dioxide (CO2)
Definition
Colorless, odorless, heavier than air gas that neither supports combustion nor burns. CO2 is used in portable fire extinguishers as an extinguishing agent to extinguish Class B or C fires by smothering or displacing the oxygen.
Term
Carbon Monoxide (CO)
Definition
 Colorless, odorless, dangerous gas (both toxic and flammable) formed by the incomplete combustion of carbon. It combines more than 200 times as quickly with hemoglobin as oxygen, thus decreases the blood’s ability to carry oxygen.
Term
Conduction
Definition
Physical flow or transfer of heat energy from one body to another through direct contact or an intervening medium from the point where the heat is produced to another location or from a region of high temperature to a region of low temperature.
Term
Convection
Definition
 Transfer of heat by the movement of heated fluids or gases, usually in an upward direction.
Term
Endothermic Heat Reaction
Definition
Chemical reaction in which a substance absorbs heat energy.
Term
Exothermic Heat Reaction
Definition
Chemical reaction between two or more materials that changes the materials and produces heat, flames, and toxic smoke.
Term
Fire Point
Definition
Temperature at which a liquid fuel produces sufficient vapors to support combustion once the fuel is ignited. The fire point is usually a few degrees above the flash point.
Term
Fire Tetrahedron
Definition
Model of the four elements/conditions required to have a fire. The four sides of the tetrahedron represent fuel, heat, oxygen, and chemical chain reaction
Term
Flammable Range
Definition
The range between the upper flammable limit and lower flammable limit in which a substance can be ignited.
Term
Flash Point
Definition
Minimum temperature at which a liquid gives off enough vapors to form an ignitable mixture with air near the liquid’s surface.
Term
Flashover
Definition
Stage of a fire at which all surfaces and objects within a space have been heated to their ignition temperature and flame breaks out almost at once over the surface of all objects in the space.
Term
Heat Release Rate (HRR)
Definition
Total amount of heat produced or released to the atmosphere from the convective-lift fire phase of a fire per unit mass of fuel consumed per unit time.
Term
Incipient Phase
Definition
First phase of the burning process in a confined space in which the substance being oxidized is producing some heat, but the heat has not spread to other substances nearby. During this phase, the oxygen content of the air has not been significantly reduced.
Term
Kinetic Energy
Definition
The energy possessed by a moving object.
Term
Matter
Definition
 Anything that occupies space and has mass.
Term
Miscible
Definition
Materials that are capable of being mixed.
Term
Potential Energy
Definition
Stored energy possessed by an object that can be released in the future to perform work once released.
Term
Radiation
Definition
The transmission or transfer of heat energy from one body to another body at a lower temperature through intervening space by electromagnetic waves such as infrared thermal waves, radio waves, or X-rays.
Term
Reducing Agent
Definition
The fuel that is being oxidized or burned during combustion
Term
Rollover
Definition
Condition in which the unburned combustible gases released in a confined space (such as a room or aircraft cabin) during the incipient or early steady-state phase and accumulate at the ceiling level. These superheated gases are pushed, under pressure, away from the fire area and into uninvolved areas where they mix with oxygen. When their flammable range is reached and additional oxygen is supplied by opening doors and/or applying fog streams, they ignite and a fire front develops, expanding very rapidly in a rolling action across the ceiling
Term
Saponification
Definition
A phenomenon that occurs when mixtures of alkaline based chemicals and certain cooking oils come into contact resulting in the formation of a soapy film.
Term
Solubility
Definition
Degree to which a solid, liquid, or gas dissolves in a solvent (usually water).
Term
Specific Gravity
Definition
Weight of a substance compared to the weight of an equal volume of water at a given temperature. A specific gravity less than 1 indicates a substance lighter than water; a specific gravity greater than 1 indicates a substance heavier than water.
Term
Thermal Layering (of Gases)
Definition
Outcome of combustion in a confined space in which gases tend to form into layers, according to temperature, with the hottest gases are found at the ceiling and the coolest gases at floor level.
Term
Vaporization
Definition
 Process of evolution that changes a liquid into a gaseous state. The rate of vaporization depends on the substance involved, heat, and pressure.
Supporting users have an ad free experience!