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Different Zones of Candle Flame Video Lecture | Science Class 8
FAQs on Different Zones of Candle Flame Video Lecture - Science Class 8
| 1. What are the different zones of a candle flame? |  |
Ans. The different zones of a candle flame are the dark zone, the blue zone, and the yellow zone. The dark zone is at the bottom of the flame and is the coldest part. The blue zone is above the dark zone and is the hottest part of the flame. The yellow zone is above the blue zone and is relatively cooler than the blue zone.
| 2. Why is the blue zone of a candle flame the hottest? | |
Ans. The blue zone of a candle flame is the hottest because it contains the most complete combustion. In this zone, the fuel (wax vapor) mixes with oxygen in the air and burns completely, producing a high temperature and a blue color. The blue color is an indicator of a high amount of heat energy being released.
| 3. What causes the yellow zone in a candle flame? | |
Ans. The yellow zone in a candle flame is caused by incomplete combustion. In this zone, there is insufficient oxygen to completely burn the fuel, resulting in a yellow color. The yellow zone is cooler compared to the blue zone because the incomplete combustion produces less heat energy.
| 4. How does the temperature vary in different zones of a candle flame? | |
Ans. The temperature varies in different zones of a candle flame. The dark zone at the bottom is the coldest, followed by the yellow zone, which is relatively cooler than the blue zone. The blue zone is the hottest part of the flame and has the highest temperature. The temperature gradually decreases as we move from the blue zone to the yellow zone and then to the dark zone.
| 5. What is the significance of understanding the different zones of a candle flame? | |
Ans. Understanding the different zones of a candle flame is significant because it helps us understand the science behind combustion. It gives us insights into the temperature variations and the process of complete and incomplete combustion. This knowledge can be applied in various fields, such as fire safety, energy production, and understanding the behavior of other flames.
Text Transcript from Video
zones of candle-flame the substances
that vaporize during burning produce
flames in the candle the molten wax
Rises through the wick and is vaporized
during burning forming flames
different zones of candle-flame and the
features one dark zone the dark zone is
formed just around the wick of the
candle flame the melted wax moves up
with the help of capillary action
through the cotton wick and vaporizes
just around the wick creating a dark
zone there is no air present here it is
the least hot of all the zones to
luminous zones as the molten wax further
vaporizes it forms a yellowish flame
known as luminous zone the luminous zone
is moderately hot because of limited
supply of oxygen three non luminous zone
the non luminous zone is the zone of
complete combustion
it looks like an aura formed around the
candle and is almost invisible it is the
hottest zone around the candle flame the
ample presence of oxygen aids in
complete combustion for blue zone the
blue zone is another zone of incomplete
combustion found at the base of the
flame the bluish hue is formed due to
the burning of carbon monoxide that
releases carbon dioxide
that vaporize during burning produce
flames in the candle the molten wax
Rises through the wick and is vaporized
during burning forming flames
different zones of candle-flame and the
features one dark zone the dark zone is
formed just around the wick of the
candle flame the melted wax moves up
with the help of capillary action
through the cotton wick and vaporizes
just around the wick creating a dark
zone there is no air present here it is
the least hot of all the zones to
luminous zones as the molten wax further
vaporizes it forms a yellowish flame
known as luminous zone the luminous zone
is moderately hot because of limited
supply of oxygen three non luminous zone
the non luminous zone is the zone of
complete combustion
it looks like an aura formed around the
candle and is almost invisible it is the
hottest zone around the candle flame the
ample presence of oxygen aids in
complete combustion for blue zone the
blue zone is another zone of incomplete
combustion found at the base of the
flame the bluish hue is formed due to
the burning of carbon monoxide that
releases carbon dioxide
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