What unique aspect of Martian fire physics might make a visible flame appear surprisingly 'cold' nearby?
Answer
Low atmospheric density hindering efficient heat transfer via conduction and convection.
Even inside a habitat where oxygen is present, the low atmospheric density (relative to Earth's) significantly impedes the efficient transfer of thermal energy through conduction and convection. This means that while a fire might visually appear to be burning, the ability of that flame to transfer heat effectively to surrounding materials, even those very close by, is reduced compared to a terrestrial flame of the same size. This reduced heat transfer makes it less effective at spreading to new fuel unless that fuel is in direct, physical contact with the burning source.
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