Explain how CO2 is able to control fires.
(i) CO2 forms a blanket around fire due to which supply of air (oxygen) is stopped.
(ii) CO2 also brings down the temperature of the fuel.
Hence able to control fires.
It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.
Which zone of a flame does a goldsmith use for melting gold and silver and why ?
Make a labelled diagram of candle flame.
Name the unit in which the calorific value of a fuel is expressed.
