What are the conditions required for a fire ?

Question

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Answer 1

Oxygen - provided in air

Fuel - sticks, kindle, stuff that burn, etc.

Heat - Lighter, but self sufficient after it's lit

Answer 2

A fire requires three elements to exist: a Heat source, a Fuel source, and an Oxygen source. These three elements are then used to sustain a chain reaction of oxidisation (combustion). Once started, the fire produces its own heat, and convection draws air into the fire. As the temperature rises, other materials may reach their ignition temperature and become fuel for the fire, thus continuing the chain reaction until one of the elements is removed (cooled, starved, asphixated). It is possible in some scenarios to disrupt the chain reaction of the elements instead by using a chemical agent, such as the one found in Dry Chemical extinquishers.

Thus, a spark at a petrol station may cause a fire, due to the presence of heat, fuel and oxygen. Oxy-acetylene welding: the acetylene is the fuel, concentrated oxygen is supplied, and a flint lighter or match provides the initial heat.

Similarly, bushfires/wildfires occur when the weather conditions are hot enough and dry enough to prepare the fuel load (trees, brush, leaf litter, etc.) to burn readily, with the fire starting due to a natural (e.g. lightning) or man-made (e.g. discarded cigarette) source.

Answer 3

to create fire you need 3 things...a fuel (wood, gas etc.), oxygen and a little energy to get the reaction going, this energy is usually in the form of heat, e.g a spark, a flame, or friction...