Question

Why does a goldsmith blow air into the kerosene lamp flame with a blow-pipe ?

Answer 1

A goldsmith blows air into the kerosene lamp flame with a blowpipe so that complete combustion of fuel takes place and the temperature of the flame increases. The goldsmith mainly uses a non-luminous flame which is termed to be the outermost part of the flame. This part of the flame is used with a metallic blowpipe for melting gold and silver because the outermost flame undergoes complete combustion and is considered the hottest part of the flame