Quotation from: General Science

Written by: Bertha M. Clark


145. Gas for Cooking. If a cold object is held in the bright flame
of an ordinary gas jet, it becomes covered with soot, or particles of
unburned carbon. Although the flame is surrounded by air, the central
portion of it does not receive sufficient oxygen to burn up the
numerous carbon particles constantly thrown off by the burning gas,
and hence many carbon particles remain in the flame as glowing,
incandescent masses. That some unburned carbon is present in a flame
is shown by the fact that whenever a cold object is held in the flame,
it becomes "smoked" or covered with soot. If enough air were supplied
to the flame to burn up the carbon as fast as it was set free, there
would be no deposition of soot on objects held over the flame or in
it, because the carbon would be transformed into gaseous matter.

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