Question

How come a coal which is burning does not have a flame but a candle which is burning have a flame on wick.WHY?

Answer 1

Answer:

Coal does not produce flame when burnt because it does not vapourize,  

only those substances which vapourize on burning produce flame like candle Wick (Wax)

Further Explanation:

Q: what is vaporization?

A: Vaporization, conversion of a substance from the liquid or solid phase into the gaseous

When a liquid is converted to a gas, the process is called evaporation or boiling; when a solid is converted to a gas, the process is called sublimation.

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