Fire Behavior Flashcards
What is Physical Science ?
Physical Science is the study o the physical world around us and includes the sciences of chemistry and physics. (pg.86)
True or False
In order for anything to burn, heat has to be generated faster than it can be dissipated, and this causes a significant increase in temperature
True (pg.86)
What is Matter ?
Matter is anything that occupies space and has mass ( weight) . Matter can undergo many types of physical and chemical changes. (pg.87)
What is a physical change?
A physical change occurs when a substance remains chemically the same but changes in size,shape or appearance. (pg.87)
What is a chemical change ?
When a substance changes from one type of matter into another. This chemical change often involves the reaction of two or more substances to form other types of compounds. (pg.87)
True or False
Oxidation is a chemical reaction involving the combination of oxygen ( or similar types of substances) with other materials.
True
Oxidation can be slow, such as the combination of oxygen with iron to form rust, or rapid, as in combustion of methane ( natural gas ). (pg.87)
Is this example a physical change or a chemical change ?
Water freezing or boiling
A physical change pg(87)
A physical change occurs when a substance remains chemically the same but changes in size,shape, or appearance.
Water freezing is changing water from a liquid to a solid, but the actual chemical make-up remains the same.
Water boiling is changing water from a liquid to a solid but the actual chemical make-up remains the same
Is this example a physical change or a chemical change ?
Combustion of methane or Combining oxygen with iron to form rust
Chemical change pg(87)
A chemical change often involves the reaction of two or more substances to form other types of compounds. This will change the chemical make-up.
Reactions that give of energy as they occur are called __________ ?
Exothermic pg(87)
What is combustion ?
.An exothermic chemical reaction that is a self-sustaining process of rapid oxidation of a fuel, that produces heat and light. pg(87)
Reactions that absorb energy as they occur are called ________ ?
Endothermic pg(87)
True or False
Converting water from a liquid to a gas ( steam) requires the input of energy and is an endothermic physical reaction.
True pg(87)
What composes the fire triangle ?
Oxygen, fuel and heat (pg87)
True or False
You have to remove at least two of the three components for a fire to be extinguished
False (pg87)
Remove any of the three components and a fire cannot start. If burning , it will be extinguished
What are the four elements that compose the fire tetrahedron ? Why use it over the fire triangle ?
Oxygen,fuel,heat, and a self-sustained chemical chain reaction (pg87)
Flaming combustion is more accurately explained using the fire tetrahedron. The fire triangle provides a reasonable explanation of nonflaming or smoldering combustion
Define Potential Energy ?
Stored energy possessed by an object that can be released in the future to perform work pg(89)
Define Kinetic Energy ?
The energy possessed by a moving object pg(89)
Define Fire Tetrahedron ?
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. Pg(88)
Define Autoignition Temperature
Same as ignition temperature except that no external ignition source is required for ignition because the material itself has been heated to ignition temperature pg(90)
Define Conduction
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 pg(94)
Define Convection
Transfer of heat by the movement of heated fluids or gases, usually
