A WAX CANDLE BURNS WITH A YELLOW FLAME. THE DOMESTIC GAS BURNS WITH A BLUE FLAME. WHY??
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Candle burns with a yellow flame because of burning of low energy fuel in a low oxygen content. The incomplete combustion of wax produces small unburnt. Carbon particles which rise in flame, get heated and give yellow and luminous flame.
it is caused by an excited state of molecular carbon dioxide that spreads its energy by collision and rotations to cause a general blue colour emission background. ... The yellow colour from burning wood is caused by soot forming in the flame, incandescent carbon particles from incomplete combustion.
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Explanation:
CANDLE WAX CONTAINS UNSATURATED HYDROCARBONS. THEY REQUIRE MORE PERCENTAGE OXYGEN FOR BURNING. BUT AIR CONTAINS ONLY 21% OF OXYGEN. DUE TO INCOMPLETE COMBUSTION OF WAX, IT PRODUCES YELLOW FLAME.
WHERE AS DOMESTIC GAS CONTAINS SATURATED HYDROCARBONS, WHICH CAN BURN WITH AVAILABLE OXYGEN IN AIR. SO COMPLETE COMBUSTION OF FUEL TAKES PLACE AND FUEL BURNS WITH BLUE FLAME.....
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