Which of the following occurs when a substance remains chemically the same but changes in size, shape, or appearance?
When a substance changes from one type of matter to another?
A chemical reaction involving the combination of oxygen (or similar types of substances) with other materials?
Reactions that give off energy as they occur?
Refers to reactions that absorb energy as they occur
Modes of combustion are different based on:
Where the reaction is occuring
Which mode of combustion requires liquid or solid fuels to be converted to the gas phase or vaporized?
Which mode of combustion occurs when solid fuels undergo oxidation at the surface of the fuel.
Nonflaming or smoldering combustion
What are the three components of the fire triangle?
Oxygen, Fuel, and Heat.
Flaming combustion is accurately best explained by what?
The fire tetrahedron
What are the elements of the fire tetrahedron?
Oxygen, Fuel, Heat, and a self-sustained chemical reaction.
Energy possessed by a moving object.
Temperature is a messurment of:
In the customary system, the unit of measure for heat is:
British thermal units (BTU)
Applying large amounts of heat to solid fuels such as wood causes.
What is the temperature to which the surface of a substance must be heated for ignition and self-sustained combustion to occur?
What is the most common source of heat in combustion reactions?
Chemical heat energy
What occurs when any combustible is in contact with oxygen?
What mode of electrical heat energy occurs when electric current flows through a conductor at a normal design limit?
What type of heat energy is generated by friction or compression?
Mechanical heat energy
The rate at which heat is transfered is related to the temperature differentialof the bodies and
Thermal conductivity of the material involved
What refers to the transfer of heat within a body or to another body by direct contact
What refers to the transfer of heat energy from a fluid (liquid or gas) to a solid surface?
What refers to transmission of energy as an electromagnetic wave without an intervening medium?
What is the dominant mode of heat transfer when a fire grows in size?
What refers to materials that absorb heat but do not participate actively in the combustion reaction?
Fuel in combustion is known as the
For flaming combustion to occur, fuels must be in the:
In order to burn, liquids must be:
What refers to the temperature at which a liquid gives off sufficient vaporsto ignite, but not sustain, combustion?