Question

We know that wood combusts with oxygen and heat. But, if we have two wooden shapes one a thin sheet and another thicker block of wood and we apply heat to them, the thin sheet burns but the block doesn’t. Can you explain why this is so?

Answer 1

Explanation:

i think

in case of wooden sheet it burns quickly

but in case wooden block it doesn't burn quickly because when we burn outer part

the inner part keep on taking heat

and takes so long to burn

Answer 2

The thin sheet of wood has a larger surface area relative to its volume, which means that more oxygen molecules can come into contact with the wood at any given time.

• The thicker block of wood, on the other hand, has a smaller surface area in comparison to its volume, which means that less oxygen can ever come into contact with the wood at one time.
• As a result, combustion cannot continue because the wood cannot easily and quickly react with oxygen. The heat causes the block of wood's outer layer to char or turns black, but it does not completely burn through.

• This is comparable to the rationale behind why kindling, which has a larger surface area in relation to its volume than a larger log of wood, which has a smaller surface area in relation to its volume, makes starting a fire easier.

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