Spontaneous ignition is fairly common in residences and small businesses.

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Spontaneous ignition, also known as spontaneous combustion, is not common in residences and small businesses. It occurs when a substance self-heats and ignites without an external heat source, but it usually requires certain conditions such as a large amount of material, poor ventilation, and high humidity. Such occurrences are rare and mostly observed in industrial settings where large piles of organic material such as coal, manure, or hay can generate heat and combust over time.

Spontaneous Ignition Is Fairly Common in Residences and Small Businesses