What is a flame ? Why does LPG form  a flame where as magnesium does not .

Dear student
A flame is a zone of combustion of gaseous substances with the evolution of heat and light.

LPG form flame because it  has a high calorific value and  It does not produce any harmful and irritating fumes during burning. It burns smoothly. It does not leave ash (residue) after burning. It is eco-friendly fuel gas.Whereas Mg do not impart any colour to the fame i.e. they do not give flame test. This is due to their very small size.
Hope it is clear
Regards

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