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why are some materials burn with flame while others without flame?

 

hope ans by meritnation expert

Dear Student,

The combustible substances like wax, which vaporize on burning produce flames.  And those combustible substances which do not get vaporize on burning do not produce flame. For example, charcoal. So it depends upon whether the substance will form vapors on burning or not.

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The things which give flames is because they give vapours on burning.

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It basically depends upon the saturation of hydrocarbons.Alkanes generally burn in air with a blue flame because %age of carbon is low which gets oxidised completely by the oxygen as copare to unsaturated hydrocarbons,but production of flame depends upon availability of oxygen too, in secant concentration of oxygen sooty flame or no any flame will be observed and substance at that time will produce energy slowly with sooty flame or just smoke only.


 
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