inner cone of a flame; reducing flame
Technical term in chemistry for the inner, cooler part of a flame where incomplete combustion occurs, often used in flame tests and reducing reactions. Contrasts with 外炎 (outer oxidizing flame).
See also: 外炎
The inner cone of a Bunsen burner flame is reducing.
We conduct the experiment using the temperature difference between the inner and outer flames.
Standard kanji form for the inner cone of a flame in chemistry contexts.
Rarely used kanji form; 焔 is a variant of 炎.
Compound of 内 (inner) and 炎 (flame). The term is a direct calque from Western chemistry terminology.