List conditions under which combustion can take place.
Burning of wood and coal causes __________ of air.
A liquid fuel, used in homes is __________
Fuel must be heated to its __________ before it starts burning.
Fire produced by oil cannot be controlled by ___________ .
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(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.