Chapter 4 Flashcards
Types of ignition
Autoignition and piloted ignition
Types of heat transfer
Conduction, convection, radiation
Temperature vs heat flux/transfer (with PPE)
Temperature tells whether it is safe to go in, heat flux/transfer tells how long you can stay in
Types of energy
Chemical, thermal, mechanical, electrical, nuclear, sound
Fire triangle (old) vs tetrahedron (current)
Triangle: Oxygen, fuel, heat
Tetrahedron: Oxidizing agent, reducing agent (fuel), heat, chemical change reaction
Two types of change to matter
Physical change - substance stays the same, but changes shape/size/state
Chemical reaction - substance changes chemical makeup
Energy vs work
?
Joules vs BTU
?
Piloted vs auto ignition
?
Pyrolysis vs vaporization
?
High pressure gases go to ___ pressure areas. Hot gases go to ___ areas
?
Smoke is an ___. It is a product of ___.
Aerosol (large non-vaporized molecules suspended in air), incomplete combustion
Air is a great ___. Copper is a great ___.
Resistor, conductor
Light, shiny, and smooth surfaces are ___. Dark, rough, and matte surfaces are ___.
Reflective, absorbent
Vapor
Gaseous state of fuel that is normally a gas or solid
Air density
1 atmosphere is normal pressure at normal temp (68F). >1 is heavier (sinks), <1 is lighter (floats).
Liquids
Have mass and volume, but no definite shape (will not expand to fill entire container as gases do. Flows downhill and pools in low areas)
Potetial vs kinetic energy
?
Vaporization, vapor pressure, rate of vaporization
?
Oxidizers
Can’t burn
Flash point and fire point
Flash point - Point at which substance will spark (not enough to sustain combustion)
Fire point - High enough temperature to self sustain combustion
Flaming vs non-flaming combustion
Flaming combustion makes fire. Non-flaming combustion burns at a lower temperature.
