· Combustion: The process of burning a substance in the presence of air (oxygen) and
undergoes a chemical reaction to produce heat and light.
· The substances which burn in air are called combustible.
· Oxygen (in air) is essential for combustion.
· During the process of combustion, heat and light are given out.
· Ignition temperature is the lowest temperature at which a combustible substance catches
fire.
· Flame: It is a zone or burning vapour. The substances which vapourise during burning give
flames. Example: Kerosene oil and molten wax.
· Inflammable substances have very low ignition temperature.
· Fire can be controlled by removing one or more requirements essential for producing fire.
· Water is commonly used to control fires.
· Water cannot be used to control fires involving electrical equipments or oils.
· There are various types of combustions such as rapid combustion, spontaneous combustion,
explosion, etc.
· There are three different zones of a flame - dark zone, luminous zone and non-luminous
zone.
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