Question

only Gases burn with a flame but when you burn wood it initially burns with a flame. Later, it only glows without a flame. What do you think is the reason for this?

Answer 1

The fact is that wood doesn't burn.

The reason why wood doesn't burn:

• Only gases burn, as you mention. Liquids and solids must first evaporate or undergo chemical breakdown to produce gases that can burn before they can really ignite.

• Now, wood cannot evaporate by itself. Most of the wood's organic molecules, cellulose, and lignin, chemically break down into simpler compounds like methanol and formaldehyde when heated to a high enough temperature. Under the heat of the flame, those evaporate, combine with the air, and burn.

• The heat produced during the burning process heats the wood more, releasing additional organic gases, and the cycle repeats.

• You could actually collect and condense such gases if you heated wood without any oxygen present (a procedure known as "destructive distillation").

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Answer 2

Answer:

Only gases burn with a flame because they vapourise on burning. Wood initially burns with a flame because of the presence of volatile gases in it. When all the gases escape, it glows without a flame