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 green leaves contain some water content with which the ignition temperature of leaves increases and they do not catch fire easily while dry leaves have no water so they catch fire easily.