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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Carbon dioxide covers the surface of the burning substance and act as blanket and hence does not allow the oxygen to reach the substance. In absence of oxygen the fire gets put off.