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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Spontaneous combustion is a type of combustion which occurs without an external ignition source. The element sodium is an example of a pyrophoric material which can undergo a kind of spontaneous (and potentially very violent) explosion when exposed to oxygen, water, or moisture in the air. Pyrophoric substances have an autoignition temperature below room temperature and often require mere contact with air or water in order to spontaneously ignite. A characteristic of pyrophoric materials is also their large specific surface of contact with air. Raney nickel is pyrophoric because of the very fine size of its particles. Rieke metals are even more dangerous.