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A gas burner (torch) that burns mapp gas is advertised to have a flame temperature of 2900 C. Steel melts at 1300 C. Gas burner tips are made of steel. How come they don't melt?

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    I'm voting to close this question as off-topic because it isn't about home improvement. It's a physics question that might be better asked at physics.stackexchange.com. – isherwood Jan 19 '17 at 17:50
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That is the temperature of the hottest part of the flame. Here is a useful picture from SE that shows temperatures for a candle flame:

temperature of candle flame

Here is a diagram for a gas flame showing how the temperature changes by region. Only the hottest point in the center is at the claimed maximum:

enter image description here

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