Ignition, Spontaneous
Ignition, Spontaneous : In general terms, this is the process wherein substances or compounds ignite as a result of an increase in temperature of the substance or compound without an independent outside ignition source and without drawing heat from its surroundings. It is sometimes called spontaneous combustion by laymen although it may occur over a long-term period such as in unventilated, piled, green hay or other vegetable products; coal dust; charcoal; and oil paint rags. The rate of heat generation, air supply, and insulation properties of the suspect fuel and surrounding environment have definite relevance to whether or not spontaneous heating will occur. In most vegetable compounds, the process may be slow; on the other hand, with unstable or rapidly oxidizing compounds, heat generation may be rapid and even explosive. The process may be luminous or nonluminous. It may occur with or without smoke
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