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Which of the following is a zone of a flame? I. Dark II. Luminous III. Non-Luminous

Which of the following is a zone of a flame? I. Dark II. Luminous III. Non-Luminous Correct Answer I, II and III

There are following three zones in the candle flame:

  • Dark
  • Luminous
  • Non-Luminous

Dark Zone:

  • This is innermost zone formed just around the wick of the candle flame as the candle burns.   
  • It consists of hot, unburnt vapours of the combustible material.
  • There is no air present here.  It is the least hot of all the zones.
  • Due to absence of oxygen unburnt part make it dark.
Luminous Zone:
  • This is middle zone it is moderately hot with limited oxygen supply.
  • Hence, the fuel vapours burn partially and produce carbon particles.
  • These particles then leave the flame as smoke and soot.
  • This zone is the major part of the flame.
  • The color of this zone is yellow.
Non-Luminous Zone:   
  • This is outermost zone it is the zone of complete combustion.
  • The ample presence of oxygen (or air) aids in complete combustion.
  • It is the hottest zone of the candle flame and does not produce much light.
  • It is blue in color.

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Hence, we can conclude that I, II and III are the zone of a flame.

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