Combustion in Reducing Atmosphere?

[stevebowers]

This question doesn't seem to have been asked very often in the past, so I'm not finding many people who are willing to come forward as an expert on the matter.
Best answer so far
http://cosmoquest.org/forum/showthread.p...ost2261512

I don't know for a fact.
However that won't stop me. The flammability limit for methane in air is 4.4 to 15%.

Perhaps to a reasonable approximation it is symmetrical, so if you had as little as 4.4% methane in the atmosphere then pure oxygen would burn in that.

Bear in mind that CH4 + 202 = CO2 + 2H20

There are two volumes of oxygen per unit volume of methane, so perhaps it is reasonable to expect a lower percentage of methane supporting an oxygen flame than the other way round.