Which flame source produces a sharp flame at about 5400 degrees Fahrenheit?

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Multiple Choice

Which flame source produces a sharp flame at about 5400 degrees Fahrenheit?

Explanation:
The flame’s heat and its shape come from the fuel-oxidizer combination. The oxyacetylene flame, produced by burning acetylene with pure oxygen, gives the hottest, most focused flame—often described as a sharp inner cone. Its temperature is in the range around 5400°F, which matches the figure in the question. This makes it the best match for a sharp, very hot flame among the options. Other fuels burn cooler or produce different flame profiles in typical brazing conditions, so they don’t fit the description as well.

The flame’s heat and its shape come from the fuel-oxidizer combination. The oxyacetylene flame, produced by burning acetylene with pure oxygen, gives the hottest, most focused flame—often described as a sharp inner cone. Its temperature is in the range around 5400°F, which matches the figure in the question. This makes it the best match for a sharp, very hot flame among the options. Other fuels burn cooler or produce different flame profiles in typical brazing conditions, so they don’t fit the description as well.

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