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 melting point of gold and silver is very high therfore goldsmiths need maximum temperature. Hence goldsmith use outermost part of the flame because it is the hottest part of flame.