Discussion
The hottest part of the gas flame is called the
Answer: D
The hottest part of a gas flame is the non-luminous zone.
There the air supply is plentiful, combustion is complete, and the flame reaches about 1,500 °C while burning pale blue. The luminous yellow zone is cooler because combustion is incomplete, its light coming from glowing carbon particles, and the innermost dark zone is unburnt gas.
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