Question

Which zone of a flame does a goldsmith use for melting gold and silver and why?

Answer 1

Understanding the concept:

• The flame (of a burner or candle) consists of three zones: the non-luminous zone, which is where total combustion occurs(outer zone).
• the luminous zone, which has a limited oxygen supply & therefore is moderately hot.
• And the black zone, which does not burn since there is no oxygen present(innermost zone).

The zone used by a goldsmith:

• A goldsmith melts gold and silver using the candle's outer flame.
• This is because the temperature is at its maximum in this region of the flame, which makes it easier for these metals to melt.