It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.
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.
A liquid fuel, used in homes is __________
Fuel must be heated to its __________ before it starts burning.
List conditions under which combustion can take place.
Conditions necessary for combustion are :
(i) Presence of combustible substance.
(ii) Attainment of ignition temperature.
(iii) Proper supply of air to provide oxygen.
Burning of wood and coal causes __________ of air.
Fire produced by oil cannot be controlled by ___________ .