when a solid is heated it changes into liquid .why wood does not melt?

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Solution

Wood is composed of several chemicals like cellulose, lignin etc. i.e. it is not a pure solid.
Secondly, when heated in air, components of wood react with atmospheric oxygen.
Hence, wood burns rather than melt.

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when a solid is heated it changes into liquid .why wood does not melt?

Wood is composed of several chemicals like cellulose, lignin etc. i.e. it is not a pure solid. Secondly, when heated in air, components of wood react with atmospheric oxygen. Hence, wood burns rather than melt.

Wood is composed of several chemicals like cellulose, lignin etc. i.e. it is not a pure solid.
Secondly, when heated in air, components of wood react with atmospheric oxygen.
Hence, wood burns rather than melt.