Question

Why some substances burn without flame?? ​

Answer 1

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substance reacts with oxygen to give off heat is called combustion. ... The substances which vaporize during burning give flames.

eg

combustion of kerosene oil produces flame.

On the other hand certain substances like coal do not vaporize and hence doesn't produce a flame.

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Answer 2

The chemical process in which a substance reacts with oxygen to give off heat is called combustion. ... The substances which vaporize during burning give flames. For example combustion of kerosene oil produces flame. On the other hand certain substances like coal do not vaporize and hence doesn't produce a flame....✏️✏️✏️✏️✏️

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