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Types of combustion
There are three main types of combustion.
Rapid combustion: It is a combustion process in which a substance burns rapidly and produces heat and light with the help of external heat. E.g. Burning of LPG.
Spontaneous combustion: Is combustion process in which a light without the help of external heat.eg. Phosphorus burns spontaneously at room temperature.
Explosion: It is a type of combustion in which a substance burns suddenly and produces heat, light and sound with the help of heat or pressure. E.g. Explosion of crackers.
CO- Leads to respiratory problem
CO2- Global warming
SO2/NO2 – Acid Rain
What happens when you add with these chemicals?
Sugar + Potassium permanganate+ Glycerin.
(i) After adding sugar, potassium permanganate and glycerin to the dish, immediately step back because spark and solid potassium permanganate will be expelled from the dish.
(ii) When potassium permanganate mixes with glycerin, a redox reaction starts. This reaction starts out really slow, but produces a lot of heat, so it will start to speed up bit by bit. As the potassium permanganate oxidises the sugar, it will speed up more and more until it finally starts to smoke and after that it will ignite.
Characteristics of good fuel
* Readily available
* Easy transport and store Burns at moderate rate
* Produce large amount of heat
* Do not leave behind any undesirable substances.
* Does not cause pollution.
Slow combustion is a form of combustion which takes place at low temperatures. Respiration is an example of slow combustion.
The conditions necessary for producing fire are,
* Air (to supply oxygen)
* Heat (to raise the temperature of the fuel beyond its ignition temperature)
* Fire can be controlled by removing any oneor more of these conditions.
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