Quotation from: General Science

Written by: Bertha M. Clark


Unburned carbon would be objectionable in cooking stoves where
utensils are constantly in contact with the flame, and for this reason
cooking stoves are provided with an arrangement by means of which
additional air is supplied to the burning gas in quantities adequate
to insure complete combustion of the rapidly formed carbon particles.
An opening is made in the tube through which gas passes to the burner,
and as the gas moves past this opening, it carries with it a draft of
air. These openings are visible on all gas stoves, and should be kept
clean and free of clogging, in order to insure complete combustion. So
long as the supply of air is sufficient, the flame burns with a dull
blue color, but when the supply falls below that needed for complete
burning of the carbon, the blue color disappears, and a yellow flame
takes its place, and with the yellow flame the deposition of soot is
inevitable.

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