What is the colour of the hottest flame?

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Detailed Solution

Blue flames are the hottest because they represent complete combustion, meaning the fuel burns fully and efficiently in the presence of sufficient oxygen. In contrast, yellow, orange, and red flames are cooler and occur when oxygen is limited, leading to incomplete combustion.

Why Blue Flames Are the Hottest

Complete combustion: A blue flame shows that the fuel is burning cleanly, converting completely into carbon dioxide and water vapor without producing soot.
Higher temperatures: This efficient combustion can reach temperatures of around 1,650 °C (3,000 °F), as seen in properly adjusted gas burners.
Incomplete combustion: Yellow or orange flames contain unburned carbon particles (soot) and indicate an oxygen shortage, making them cooler.
Red flames: These are the coolest of all, forming at the lowest temperatures due to poor combustion efficiency.

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