the flame to create a vortex with a height of about 60 centimeters. Eventually,
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, the chaotic fire whirl calmed into a blue, cone-shaped flame just a few centimeters tall, the scientists report?online August 4 in Proceedings of the National Academy of Sciences,
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.
“Firenadoes” are known to appear in wildfires,
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, when swirling winds and flames combine to form a hellacious,
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, rotating inferno. They burn more efficiently than typical fires,
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, as the whipping winds mix in extra oxygen, which feeds the fire. But the blue whirl is even more efficient; its azure glow indicates complete combustion, which releases little soot,
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, or uncombusted carbon, to the air.
The soot-free blue whirls could be a way of burning off oil spills on water without adding much pollution to the air,
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, the researchers say,
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, if they can find a way to control them in the wild.








SWIRLING FLAME Fuel burning on top of water produces a flaming tornado that transitions into a calmly spinning blue whirl.H

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