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Flammability or Inflammability is the ease with which a substance will ignite, causing fire or combustion. Materials that will ignite at temperatures commonly encountered are considered flammable, with various specific definitions giving a temperature requirement. The flash point is the important characteristic. A volatile substance may have sufficient vapor pressure to form flammable (or even explosive) mixtures with air in temperatures as low as –10 °C, so that ignition can occur even without direct contact. Flash points below 100 °F (37.8 °C) are regulated in the United States by OSHA as potential workplace hazards. Examples of flammable liquids are gasoline, ethanol, and acetone. Diesel fuel is in one of the less heavily regulated flammability categories, and biodiesel is considered nonflammable or noninflammable with a flash point usually over 300 °F (150 °C) even though biodiesel will combust inside a diesel engine.