Give reasons :
Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.
The ignition temperature of paper is less, so it catches fire easily. It does not catch fire when wrapped around aluminium pipe because aluminium absorbs the heat, so paper does not attain its ignition temperature.
A liquid fuel, used in homes is __________
Fuel must be heated to its __________ before it starts burning.
Burning of wood and coal causes __________ of air.
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.
Fire produced by oil cannot be controlled by ___________ .