Pyrolysis
the chemical decomposition of matter through the action of heat
true
Gas molecules vibrate faster than solid molecules
fire
is the rapid, self-sustaining oxidation process accompanied by the evolution of heat and light in varying intensities.
common
fires involve a fuel composed of mostly carbon and hydrogen in an atmosphere with oxygen present.
Scientific theory and experiments show
that there is a limit to which matter can be cooled
21; 78
Air is a mixture of _____% oxygen and _____% nitrogen, with 1% of other elements remaining
hydrocarbon
is the main element in organic fuels
chemical chain reaction
is the fourth component of fire
molecules
vibrate at normal temperatures
chemical chain reaction
The four components of a fire tetrahedron are fuel, air, heat, and ____
fuel
is described as anything that will burn
oxygen
is a by-product of incomplete combustion
matter
Solids, liquids, and gases are the three states of _____
during growth stage
convected heat rises and preheats fuels above the fire
specific gravity
The weight of a liquid as compared to the weight of an equal volume of water
volatility
The ease with which a fuel gives off vapors at ambient temperature
flash point
minimum temperature of a liquid at which it gives off vapors sufficient to form an ignitable mixture with air, but ignition is not sustained
Miscibility
the ability of a substance to mix with water
vapor density
The relative density of a vapor or gas as compared to air
gas
always fills the container in which it is stored
chemical heat/energy
is based on the breaking down and recombination of molecules
class D
combustible metals
class C
electrical
class B
flammable/combustible liquids
class A
ordinary combustibles
class K
cooking materials (oil,fats,grease)
conduction heat
transfer of heat through a medium without visible motion (pan on stove)
convection heat
transfer of heat through circulating medium (liquids/gases)
radiant heat
transfer of heat by wave lengths of energy
upper flammability limit
a vapor that is above its ________ is said to be "too rich to burn".
boiling point
The point at which vapor pressure equals atmospheric pressure at the surface of the liquid