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 substances in which combustion takes place are called combustible substances. For example : wood, paper, coal. The substances in which no combustion takes place are called non-combustible substances. For example : Glass, iron nail.