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On a forest campfire, you observe that the Wood taken from a tree nearby initially burns with a flame but later only glows red and gives out heat without a flame. What could be a possible reason behind this?
Volatile gases in the wood fuel burn out gradually.
The moisture content of wood reduces on burning.
It is a gradual chemical change.
The latent heat of fusion of the wood fuel reduces afterwards.
? Later when the volatile substances burn out, and only the soild fuel remains, you will see only heat and red glow without flames. ? A luminous flame is seen when the atoms of a gaseous substance are heated and start to glow. The colour produced by each element is a characteristic property of that element.
By: Anupama Sharma ProfileResourcesReport error
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