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

Answer 1

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

A neutral flame has a relatively well-balanced stoichiometric proportion of reactant gases and is neither oxidizing nor reducing:

#H-C-=C-H(g) + 5/2O_2 rarr 2CO_2(g) + H_2O(g)#

Thus, in order to reach stoichiometric proportion, the oxygen bleed is larger.

Once more, this is a practical matter; the welder modifies the fuel and oxygen valves to bring the flame to a temperature that is intended under an oxidizing (tweak the oxygen cylinder) or reducing (tweak the acetylene valve) regime.

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Answer 2

Jeremiah Adams

An oxygen and acetylene balance characterizes a neutral flame.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.