MindMap Gallery Chapter 2 Fire
Chapter 2 of the "Practice" of the First Class Fire Engineer: Fire, which introduces the classification of fires, the basic principles and methods of fire prevention and fire extinguishing, and the special phenomena of indoor fires in buildings.
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Avatar 3 centers on the Sully family, showcasing the internal rift caused by the sacrifice of their eldest son, and their alliance with other tribes on Pandora against the external conflict of the Ashbringers, who adhere to the philosophy of fire and are allied with humans. It explores the grand themes of family, faith, and survival.
This article discusses the Easter eggs and homages in Zootopia 2 that you may have discovered. The main content includes: character and archetype Easter eggs, cinematic universe crossover Easter eggs, animal ecology and behavior references, symbol and metaphor Easter eggs, social satire and brand allusions, and emotional storylines and sequel foreshadowing.
[Zootopia Character Relationship Chart] The idealistic rabbit police officer Judy and the cynical fox conman Nick form a charmingly contrasting duo, rising from street hustlers to become Zootopia police officers!
fire
Classification according to the nature of burning objects
Class A solid
Wood, cotton, wool, linen, paper, etc.
Class B liquid or meltable solid
Gasoline, kerosene, crude oil, methanol, ethanol, asphalt, paraffin, etc.
Class C gas
Coal gas, natural gas, methane, ethane, hydrogen, acetylene, etc.
Class D metal
Potassium, sodium, magnesium, titanium, zirconium, lithium, etc.
Class E live
Live fires in transformers, etc.
Category F Cooking materials in cooking utensils
Animal or vegetable fats
2017 real questions
According to fire accident disaster damage caused Classification of degree of loss
Two strict principles
Those who reach the indicator line should adhere to the strict principle
Multiple indicators should adhere to the principle of strictness
Building fire development and spreading mechanism
Heat transfer basics
Heat Conduction
thermal convection
Heat radiation
2017 real questions
stage of development
Basic principles and methods of fire prevention and fire extinguishing
physical method
cooling fire extinguishing
Water has a large specific heat capacity and high heat of vaporization, Cooling performance is very good. The effect of water spray is more obvious
Among the fire extinguishing agents, only IG541 has no cooling mechanism.
Isolate fire fighting
My personal understanding is: use all means to isolate the fire from unburned combustibles. See comments for official explanation
Among fire extinguishing agents, only foam and dry powder have isolation mechanisms.
Suffocation to extinguish fire
Generally, when the oxygen concentration is lower than 15%, combustion cannot be maintained.
Inject carbon dioxide, nitrogen, water vapor, etc. into the fire scene.
summary
chemical suppression fire extinguishing
This method is effective for flaming fires. For deep fires, due to poor permeability, the fire extinguishing effect is not ideal.
Dry powder, heptafluoropropane
Features: Fast fire extinguishing
How building fires spread
chimney effect
Special phenomena of indoor fires in buildings
Banglang, due to its short time, is generally called a phenomenon, not a stage.
Backlash, backlash usually occurs in poorly ventilated areas Indoor fire occurs when doors and windows are opened or damaged.
Stages of development of indoor fires in buildings
In the initial growth stage, fuel-controlled fires.
Fully developed stage, ventilation controlled fire.
Decay phase, when the average indoor temperature drops At 80% of its peak value, the fire enters the decay stage