The blue zone in a candle flame is blue in colour due to complete combustion. Complete combustion takes place in invisible (non-luminous) zone also. Instead of becoming blue in colour, why is it invisible to us?

The blue zone at the bottom of the wick of a burning candle is due to burning of carbon-monoxide gas produce by the incomplete combustion of carbon particles in wax.

Whereas the non- luminous zone is the outermost zone of the flame where complete combustion of wax takes place. It is faintly blue in colour but hardly visible.


  • 5

it becomes invisible as a result of complete combustion the remains are carbomdioxide and wax which are in gaseous form.

  • -2

because the carbon particles are in complete combustion ,becomes gas and are not visible to us.

  • -2
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