Why do substances burn with or without a flame? – InterviewSolution

InterviewSolution

1.	Why do substances burn with or without a flame?
Answer» The chemical process in which a substancereacts with oxygen to give off heat is called combustion. ... The substanceswhich vaporize during burninggiveflames. For example combustion of kerosene oil produces flame. On the other hand certain substanceslike coaldonot vaporize and hence doesn't produce aflame.

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