Fire : It is an active rapid burning and oxidation process accompanied by heat, light and poisonous gases or smoke due to combustion.

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Flame : It is a visible luminous, hot zone gaseous part of the fire.

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Hotspot : It is a spot where fire ignite or start or begin.

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Smoke : It is a suspension of fine particles of solid in air produced during the burning of a substance, generally black to white in colour, consists of soot, ash and other solid particles.

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Soot : It is a mass of impure carbon particles resulting from the incomplete combustion of hydrocarbons.

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Ash : It is a solid remains of fire.

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Fume : It is an unpleasant and unhealthy smoke and gases which are produced by fires.

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Ignite : It is to set fire or to begin fire or catching of fire.

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Ignition : It is beginning of fire or start of fire.

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Ignition Temperature : It is a temperature at which the combustible material ignites.

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Self or Spontaneous Ignition : It is an ignition without an application of external flame or igniter.

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Spontaneous Ignition Temperature : It is a temperature at which combustible material get ignited without an application of external flame or igniter.

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Flash Point : It is a temperature at which combustible material gives off enough vapour in the vicinity to initiate ignition on application of external flame or igniter.

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Fire Point : It is a lowest temperature at which vapours above a liquid will continue to burn once ignited. Fire point is always higher than the flash point.

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Auto - Oxidation : It is a process of slow oxidation with accompanying evolution of heat, sometimes leading to auto-ignition if the energy is not removed from the system.

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Flammability Limits : It is a mixture of dispersed combustible materials and oxygen in the air which will burn only if the fuel concentration lies within well defined lower and upper bound determined experimentally.

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• Lower Flammability Limit (LFL) : It is the lowest concentration or percentage of a gas or a vapour in air which is capable of producing a flash of fire in the presence of an ignition source. Concentrations lower than LFL are "too lean" to burn.

• Upper Flammability Limit (UFL) : It is the highest concentration or percentage of a gas or a vapour in air which is capable of producing a flash of fire in the presence of an ignition source. Concentrations higher than UFL are "too rich" to burn.

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Fire Extinction : It is putting off of the fire.

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Fire Fighting : It is an action of putting off of the fire.

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Fire Prevention : It is preventing the occurrence of fires by prior actions or precautions and provisions.

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Fire Backdraft : It ia a rapid or explosive burning of superheated gases in a fire, caused when oxygen rapidly enters an oxygen-depleted environment.