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Question

Why do goldsmiths use outermost flame to burn gold and silver?

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Solution

A flame mainly contains three parts; the outermost part, the middle part and the innermost part. The outer part of the flame provides the maximum heat, and it produces a blue color.
Goldsmiths melt gold and silver with the use of outermost part of the flame because gold and silver have a high melting point and they require a maximum amount of heat.
The outermost part of the flame contains a high amount of heat, and it also allows the particles to undergo complete combustion.

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