Flame
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Flame
Combustion and Flame of Class 8
FLAME
A flame is a region where combustion of fuel takes place. Flame is the zone of combustion of a combustible substance.
Substances which vapourise during burning produce flames.
e.g. kerosene, wax etc.
Substances which do not vapourise during burning do not produce flames.
e.g. coal, charcoal etc.
A flame is the product of a highly exothermic reaction.
Exothermic reactions are those reactions in which a large amount of energy is released.
A flame is the visible (light - emitting) part of a fire.
COLOUR OF FLAME:
Colour of flame depends on the temperature, amount of air supplied, and the substance burning.
Ex: flames produced by hydrocarbon fuels are either blue or yellow.
TYPES OF FLAME :
A flame can be of two types:
(i) Luminous flame (ii) Non-luminous flame
|
S.No. |
Luminous flame |
Non-luminous flame |
|
1. |
This flame is accompained with sufficient amount of heat and light. |
This flame is accompained with heat but very little light. |
|
2. |
This type of flame is observed when there is insufficient oxygen. |
This type of flame occurs because of complete combustion of hydrocarbons in the presence of excess of oxygen. |
|
3. |
It leaves black soot and other residue. |
This type of flame does not leave any residue. |
|
4. |
Yellow flame is a luminous flame. |
Blue flame is non-luminous flame. |
