What Is the Difference Between Blue Flame and Yellow Flame

As it relates to hydrocarbon gases, blue flame is indicative of complete combustion whilst a yellow flame indicates incomplete combustion. An LPG blue flame also burns hotter, at around 1,980°C, vs about 1,000°C for a yellow flame.

Which is hotter a blue or yellow flame?

In a flame the outer most layer or the blue flame is hotter than the Yellow or Red flame because a “complete combustion” takes place in the area.

Why flame is yellow and blue?

The yellow arises from incandescence of very fine soot particles that are produced in the flame. When the air inlet is opened, less soot is produced. When enough air is supplied, no soot is produced and the flame becomes blue.

Sarah Jenkins

Sarah Jenkins

Senior Technology Editor & AI Specialist

Sarah Jenkins is a veteran tech journalist with over 12 years of experience covering artificial intelligence, mobile innovations, and digital ethics. Her insights have appeared in leading technology publications worldwide.

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