noun
outer cone of a flame; oxidizing flame
Chemistry term for the outer, oxidizing part of a flame, contrasted with 内炎 (inner cone/reducing flame).
See also: 内炎
ブンゼンバーナーの外炎は酸化炎として使われる。
The outer cone of a Bunsen burner is used as an oxidizing flame.
外炎の温度は内炎より高い。
The temperature of the outer cone is higher than that of the inner cone.
内炎 is the inner, reducing cone of a flame, while 外炎 is the outer, oxidizing cone.
Compound of 外 (outer) and 炎 (flame).