# Neutral flame is what type of flame with a balance of oxygen and acetylene?

May 10, 2017

You should ask a welder for his input. And goddammit I am a chemist.

#### Explanation:

A neutral flame is neither oxidizing nor reducing; the stoichiometric proportion of reactant gases are fairly well balanced:

$H - C \equiv C - H \left(g\right) + \frac{5}{2} {O}_{2} \rightarrow 2 C {O}_{2} \left(g\right) + {H}_{2} O \left(g\right)$

So the oxygen bleed is greater to achieve stoichiometric proportion.

Again, this is a practical issue; the welder adjusts the oxygen and fuel valves so that the flame reaches a purpose-specific temperature under a reducing (tweak the acetylene valve) or oxidizing regime (tweak the oxygen cylinder).