✯QUESTIONS:
4️⃣Can you burn a piece of wood by bringing a lighted matchstick near it? Explain it.
7️⃣The middle zone of the candle flame is luminous. Give reason.
[CHAPTER: 07; COMBUSTION]
[CLASS: 08]
EXPLAIN THE ANSWERS!
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Answers
Explanation:
1.) No we cannot burn a piece of wood by bringing a lighted matchstick near it. When a lighted matchstick is brought near a piece of wood it does not start burning because the ignition temperature of wood is higher than a piece of paper. A matchstick can light a tiny splinter of wood but not a big log of wood.
2.) In the middle zone, because of insufficient air, wax vapours undergo incomplete combustion. The incomplete combustion of wax vapour produces carbon particles. These unburnt particles get heated up and start glowing. These glowing carbon particles make the flame luminous. Thus, the middle zone of the candle flame is luminous due to incomplete combustion of wax vapour to this zone.
Explanation:
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