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The Hottest part of the gas flame is known as the?
1. Non-luminous zone
2. Luminous zone
3. Blue zone
4. Dark zone

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Correct Answer - Option 1 : Non-luminous zone

The correct answer is the Non-luminous zone.

​ The Hottest part of the gas flame is known as the Non-luminous zone.

  • The Non-luminous zone flame is blue.
    • In this zone, complete combustion of the fuel takes place because there is plenty of air around it.
    • The outermost zone has the highest temperature in the flame.
    • It is the hottest part of the flame.
    • It is quite thin as compared to the middle zone.

  • A region of burning gases is called flame.
  • There are three different zones of a flame:
    • Dark zone.
    • Luminous zone.
    • Non-luminous zone​
  • When the oxygen supply is insufficient, the fuel burns partially by producing a yellow flame, it is said to be a luminous flame.
    • A luminous flame appears to be yellow in color.
    • When kerosene burned in a lamp, it produces a luminous flame.

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