Which zone of a flame does a goldsmith use for melting gold and silver and why ?
A goldsmith uses the outer zone (non-luminous zone) of candle flame to melt gold and silver because it is hottest zone and has more temperature.
It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.
Explain how CO2 is able to control fires.
Make a labelled diagram of candle flame.
Name the unit in which the calorific value of a fuel is expressed.
