The outer most zone is used to melt metal why
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Goldsmiths blow the outer most zone of a flame in order to melt gold or silver because the outermost zone is a zone of complete combustion, also known as luminous zone. The ignition temperature of this zone is the highest and thus helps in melting the metal the best in order to creat desired designs or patterns.
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The outermost zone of the flame is used to melt metal because in the outermost zone the volatile substances undergo complete combustion which produces maximum heat due to which it appers blue. The large ammout of heat melts the metal
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