Flashcards in Chapter 5 Deck (57)
What is a chemical process of oxidation that occurs at a rate fast enough to produce heat and usually light i the form of either a glow or a flame?
What is a rapid oxidation process which is a chemical reaction resulting in the evolution of light and heat in varying intensities?
What is a form of energy characterized by the vibration of molecules and is capable of initiating and supporting chemical changes and changes in state?
What is the measure of a materials ability to transfer heat energy to other objects?
What is a material that will main combustion under specified environmental conditions?
What is any material that readily yields oxygen or other oxidizing gas, or that readily reacts to promote or initiate combustion of combustible material?
What is potential energy?
stored energy possessed by an object that can be released in the future to perform work once released
What is kinetic energy?
the energy possessed by a body because of its motion
What is defined in terms of mechanical energy? It is equal to the energy expanded in applying a force of one newton through a distance of one meter.
What is an exothermic reaction?
chemical reaction that releases thermal energy or heat
What is an endothermic reaction?
chemical reaction that absorbs thermal energy or heat
What is pyrolysis?
the chemical decomposition of a solid material by heating. Pyrolysis often precedes combustion
What is the physical process that changes a liquid into a gaseous state?
What is ignition?
the process of initiation self-sustained combustion
What are the two forms of ignition?
piloted ignition and autoignition (non piloted)
What is the moment when a mixture of fuel and oxygen encounters an external heat source with sufficient heat or thermal energy to start the combustion reaction?
What is the initiation of combustion by heat but without a spark or flame
What is the autoignition temperature?
the minimum temperature to which a fuel in the air must be heated in order to start self-sustained combustion. The autoignition temperature of a substance is always higher than its piloted ignition temperature
What is a visible, luminous body of a burning gas emitting radiant energy including light of various colors given off by burning gases or vapors during the combustion process?
What is the fire triangle?
a model used to explain the three elements necessary for combustion (heat fuel and oxygen)
What is the fire tetrahedron?
model of four elements required for a fire. the four sides represent fuel, heat, oxygen, and self-sustaining chemical chain reaction
What are materials that absorb heat but do not participate actively in the combustion process/
What causes the most fire deaths?
What is a colorless, odorless, dangerous (both toxic and flammable) gas formed by the incomplete combustion of carbon? It combines with hemoglobin more than 200 times fast than oxygen does
What is a colorless toxic and flammable liquid until it reaches 79 degrees F? Above that temperature it becomes a gas with a faint odor similar to bitter almonds
What is a colorless odorless heavier than air gas that neither supports combustion nor burns? This is used in portable fire extinguishers as an extinguishing agent to extinguish class B or C fires by smothering or displacing oxygen.
What is the kinetic energy associated with the random motions of the molecules of a material or object? This is often used interchangeable with the terms heat and heat energy
What is the measurement of heat?
What form of oxidation is a chemical reaction that increases the temperature of a material without the addition of external heat?