Chapter # 5 Fire Behavior Flashcards
Physical science is the study of …… and …… and includes chemistry and physics.
matter and energy
Anything that occupies space and has mass.
Matter
What type of change occurs when a substance changes in size, shape or appearance, but the chemically stays the same?
Physical Change Ex: Water freezing, Water boiling
What type of change occurs when a substance changes from one type of matter to another?
Chemical change
When two or more substances combine they form a?
Compound
A chemical reaction involving the combination of a oxidizer, with another material.
Oxidation
The capacity to perform work.
Energy
Stored energy possessed by an object that can be released in the future to to perform work once released.
Potential Energy
The energy possessed by a body because of its motion.
Kinetic Energy
List seven types of energy.
chemical, thermal, electrical, mechanical, light, nuclear, sound
Can all energy change from one type to another?
Yes
In terms of a fire, the potential chemical energy of a fuel is converted to thermal energy and released as?
Heat
Name the measure of energy in the International System of Units (SI) and also for the customary system.
SI = Joules (J) Customary = Btu
How many joules does it take to change the temperature of one gram of water by one degree Celsius?
4.2 joules
The amount of heat required to raise the temperature of 1 pound of water 1 degree Fahrenheit.
Btu
How many joules = 1 Btu?
1055J
Reactions that emit energy are called?
Exothermic ex: fire
Reactions that absorb energy are called?
Endothermic ex: converting water to steam.
A chemical process of oxidation that occurs at a rate fast enough to produce heat and usually light in the form of either a glow or a flame?
Combustion
A rapid oxidation process, which is a chemical reaction resulting in the evolution of light and heat in varying intensities?
Fire
A form of energy characterized by vibration of molecules and capable of initiating and supporting chemical changes and change of state.
Heat
Measure of a materials ability to transfer heat energy to other objects.
Temperature.
A material that will maintain combustion under specific environmental conditions.
Fuel
Any material that readily yields oxygen or other oxidizing gas, or that readily reacts to promote or initiate combustion of combustible materials.
Oxidizer