Which zone of a flame does a goldsmith use for melting gold and silver and why?
Answer:
Goldsmiths use the outermost part/zone of the flame to melt gold and silver. This is because the outermost zone of the
flame undergoes complete combustion and is the hottest part of the flame.
Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Abida kept the beaker near the
wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame. Whose water will get
heated in a shorter time?
Give reasons.
(a) Water is not used to control fires involving electrical equipment.
(b) LPG is a better domestic fuel than wood.
(c) Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.