Question

burnig of wood gives ashes whereas burning of wood covered with clay gives charcoal. give reason
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Answer 1

The reduction of ignitability and combustibility of wood products is based on chemical and physical means that have an effect on different stages of ignition and burning, for example:

heat induced changes of the internal structure of wood in molecular level;

physical and chemical processes of compounds produced in these changes, both inside the wood and in the gases formed above it;

transfer of heat in a wood product;

transfer of oxygen into reaction areas.

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