Combustion
Liquified petroleum gas, paper, coal
Give a few examples of Combustible Substances
Luminous Zone
Dark zone
What are the 3 main zones of the flame?
Primary fuels and Secondary Fuels
Water cannot be used to extinguish fires caused by electrical short circuit
Water is a conductor of electricity, therefore it may spread the fire
Oxygen is required for combustion to take place
Coal, LPG
Ignition temperature
What are the conditions necessary of combustion to take place?
Complete combustion of wax vapour takes place
What is the outermost zone in a flame?
Wood : 17000 - 22000
Kerosene : 45000
LPG : 46000
What are the calorific value of different materials?
2NaHCO3 + H2SO4 ----> Na2SO4 + 2H2O + 2CO2
What is the formula for Soda Acid Fire Extinguisher?
inflammable substances are the substances that catch fire with a minor spark
What are Inflammable substances?
Orangish yellow colour of the flame.
what is the middle zone?
the heat liberated when 1 gram of fuel is burnt completely in oxygen
Define Calorific Value
A portable apparatus which is often used to put off fire
what is a Fire Extinguisher?
Sodium is stored in kerosene to avoid contact with air
What is an example of Spontaneous Combustion
Coal does not produce a flame while burning, but kerosene oil converts into vapours and therefore produces a flame
What is necessary for a flame to be produced?
It should be easily available
It should be economical
It should not release harmful gases that pollute the environment
what are the charecterstics of an Ideal FUel?
Red painted body with a black band around its neck
How can we identify Carbon Di Oxide Fire extinguisher?
The burnt particles of Sulphur and Phosphorous is heavier than the initial weight of the substances
What did Antoine Laurent Lavoister discover?
Spindle shaped
What is the shape of a flame?
Kj/Kg is the SI unit of ___________
Calorific Value
Stop, Drop and Roll
When your clothes catch fire, what should we do??