Question

why kerosene added or sprinklers on the log of wood before we start fire on wood or coal​

Answer 1

Answer:

Because ignition temperature of wood or coal is higher then that of the paper or kerosene oil. So, when we burn kerosene or paper it provide sufficent heat till it reach ignition temperature and burn wood or coal.

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Answer 2

Answer:

The ignition temperature of paper and kerosene oil is low in comparision to wood or coal. Therefore, a burning paper or kerosene on wood is used to start fire in wood and coal. ... This fire cause wood and coal to attain their ignition temperature so that they also catch fire.