Question

Arrange the different regions of a flame in increasing order of temperature.
Middle region < inner region < outermost region
Inner region < outermost region < middle region
Inner region < middle region < outermost region​

Answer 1

Inner region < middle region < outermost region

Inner region < middle region < outermost regionSolution: The inner region of a flame mostly has vapourised wax and very little burning takes place there, so its temperature is lowest. The middle region undergoes partial burning and therefore has an intermediate temperature. The outermost region gets maximum oxygen supply and complete combustion takes place. So, the temperature is maximum in the outermost region.

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Answer 2

The different regions of a flame in increasing order of temperature is- Inner region < middle region < outermost region.

• There are three zones in a candle on the basis of their color- inner zone, middle zone and outermost zone.
• Outermost zone- As supply of oxygen is sufficient, complete combustion takes place in this zone. Hence, it has the highest temperature and is blue in color.
• Middle zone- Due to insufficient oxygen, incomplete combustion takes place in middle zone. Hence, it has a moderate temperature and is yellow in color.
• Inner zone- Due to non availability of oxygen, this zone contains unburnt fuel particles or wax particles. Hence, this zone has the lowest temperature and is black in color.