5. Describe the structure of the flame of a candle
6. Give the history of matchstick in brief
Answers
hey here ur ans
The first successful friction match was invented in 1826 by John Walker, an English chemist and druggist from Stockton-on-Tees, County Durham. He developed a keen interest in trying to find a means of obtaining fire easily.
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Answer:
5. OUTER ZONE : it is the hottest and non luminous part of the candle flame. complete combustion takes place here.it gives out very little light and the flame appears blue.
*MIDDLE ZONE:This zone of flame gives out light of yellow colour.Partial combustion take solace here as the carbon particles do not burn completely.This zone is not very hot and particles produces smoke.
*INNER ZONE:This zone lies near the wick and is black in colour due to unburnt particles of carbon.It is least hot part of flame where no combustion takes place.
THAT'S YOUR ANS BUT SORRY I DON'T KNOW THE 6 ONE SORRY