Question

which zone of a candle flame luminous and why?

Answer 1

A non-luminous flame undergoes complete combustion as it draws much more oxygen and gets much hotter. There are several "zones" within a non-luminous flame, and each zone has a different temperature. The outermost zone of the flame is blue in colour and it is the hottest part. This is due to complete combustion.

Answer 2

hi mate here's is u r ans

hope it is right

upper part of candle flame very fast