How to Say "Blue Flame" in Japanese

青い炎

aoi honō

The English phrase "blue flame" is translated into Japanese as 青い炎 (aoi honō).

青い炎 refers to a flame that has a blue color.

What does it mean word for word?

The phrase is composed of the adjective 青い (aoi), meaning "blue" and the noun 炎 (honō), meaning "flame".

The adjective 青い directly precedes the noun 炎 to describe it.

aoi honō

The word 青 (ao) was historically used to describe both 'blue' and 'green'. This is why Japanese people still call a green traffic light 青信号 (ao-shingō), literally 'blue signal'.
In Japanese culture, 青い (aoi) is often associated with youth and inexperience. The term 青い can be used metaphorically to describe a person who is naive or immature, similar to the English phrase 'green around the gills' or 'green' for a novice.
In modern Japanese pop culture, especially in anime and manga, a 青い炎 (blue flame) is often used as a visual shorthand to represent a power that is far hotter and more destructive than a standard red flame.

硫黄は青い炎を上げて燃える。
Sulfur burns with a blue flame.
This sentence is useful for showing how sulfur burns with a 青い炎.
Tatoeba #78217 by mookeee, translation #325501 by CM
科学実験で、青い炎が目撃されました。
In a scientific experiment, a blue flame was observed.
このキャンドルの青い火はとても美しい。
The blue flame of this candle is very beautiful.
ガスコンロの青い炎を確認してください。
Gasukontoro no aoi honoo o kakunin shite kudasai.
Please check the blue flame of the gas stove.

Kenta and Himari are watching a science experiment.

健太 Kenta

見て、あそこに青い炎が見えるよ。
Mite, asoko ni aoi honoo ga mieru yo.
Look, I can see a blue flame over there.
陽葵 Himari

本当だ。すごく不思議な色だね。
Hontō da. Sugoku fushigi na iro da ne.
You're right. It's a very mysterious color.
健太 Kenta

温度が高いから、青い炎になっているんだって。
Ondo ga takai kara, aoi honoo ni natte iru ndatte.
They say it's a blue flame because the temperature is high.
陽葵 Himari

健太君、科学の知識はすごいね。
Kenta-kun, kagaku no chishiki wa sugoi ne.
Kenta, your scientific knowledge is amazing.

Sources

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