ISFTA CO Ch. 9 Flashcards
Rapid fire growth usually occurs during which stage of fire development?
growth
Understanding fire dynamics is ….
understanding everything that can happen during the growth stage
T/F: If the fire enters a vent-limited decay phase it is in its final stage of development.
False
the area where sufficient air is available to feed the fire
combustion zone
A fire is in it’s growth stage until …
it has reached its peak heat release rate due to lack of fuel or oxygen
When a fire cannot grow without the introduction of new oxygen or fuel , it has left the (blank) phase and become (blank).
growth; fully developed
What are the two common routes to full development?
fire consumes all available oxygen and transitions to a state of ventilation-limited decay
The fire has enough oxygen to move through there growth phase and possibly through rapid fire development
The tendency of gases to form into layers according to temp, density and pressure
thermal layering
What can significantly alter thermal layering?
flow path / ventilation
The space between the air intake and the exhaust outlet
flow path
What causes the hot gas layer to spread downward within a compartment and laterally?
high pressure
(blank) can move through the hot gas layer.
Isolated (intermittent) flames
what is the net pressure of the neutral plane?
zero
what is a ceiling jet?
Hot fire gases and fuel rich smoke spread across the ceiling horizontally
Most residential fires that develop beyond the incipient stage become (blank)
vent limited
