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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The empty glass catches fire easily, but the glass with water does not because when heated the heat produced is absorbed by the water. Thus, its temperature is lowered and it does not catch fire.