What is Fire??

Do you know what is fire? How it's form? Let's me tell you. 

Fire is combustion or burning, in which substances combine chemically with oxygen from the air and typically give out bright light, heat, and smoke. Fire in its most common form can result in conflagration, which has the potential to cause physical damage through burning. Fire is an important process that affects ecological systems across the globe. The positive effects of fire include stimulating growth and maintaining various ecological systems. Fire has been used by humans for cooking, generating heat, signaling, and propulsion purposes. The negative effects of fire include water contamination, soil erosion, atmospheric pollution and hazard to human and animal life.

Fires start when a flammable and/or a combustible material, in combination with a sufficient quantity of an oxidizer such as oxygen gas or another oxygen-rich compound (though non-oxygen oxidizers exist that can replace oxygen), is exposed to a source of heat or ambient temperature above the flash point for the fuel/oxidizer mix, and is able to sustain a rate of rapid oxidation that produces a chain reaction. This is commonly called the Fire Triangle. Fire cannot exist without all of these elements in place and in the right proportions.

Fire Triangle

There are six classes of fire:

1. Class 'A' - wood, paper, textiles, etc.
2. Class 'B' - oil, petrol, paint, etc. (liquid fires)
3. Class 'C' - flammable gases, e.g. natural gas, hydrogen, propane, butane.
4. Class 'D' - combustible metals, e.g. sodium, magnesium, and potassium.
5. Class 'E' - electrical fires.
6. Class 'F' - cooking fats and oil.