Fire is the visible result of a solid or a liquid being broken down into a gaseous form through the combustion process. Different elements can give you different colored flames which can be useful for identifying elements in chemistry.
Chemical.
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Burning is a chemical change.
A fire is a chemical change due to the irreversible changes that happen.
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Chemical.
Burning is a chemical change.
Physical changes are melting and boiling in this case; fire is a combustion, a chemical change.
chemical