The most authoritative answer in 2024
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Zoe Gonzalez——Studied at the University of Tokyo, Lives in Tokyo, Japan.
Propane flames are
blue with yellow tips. The
hottest fires are from oxyacetylene torches (about 3000 degrees Centigrade) that combine oxygen and gas to create pinpoint
blue flames. ... The inner core of the candle flame is light
blue, with a temperature of around 1800 K (1500 --C). That is the
hottest part of the flame.
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