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combustion and flame
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A chemical process in which a substance reacts with oxygen to give heat and light is called combustion .The light which is given off during combustion can be in the form of flame or as glow.
magnesium+o2=magnesium oxide +heat+light
It is a combustion process.
(charcoal is mainly carbon)
co2+o2=co2+heat+light
Since coal burns in air to produce carbon dioxide, heat and light. Thus, charcoal and coal are combustible
substances.(respiration is a kind of combustion.)
Air is necessary for combustion.
Presence of combustible substances.
In the sun heat and light are produced by nuclear reaction.
The lowest temperature at which a substance starts burning is called its ignition temperature.
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