Deflagration is a type of combustion that occurs at subsonic speeds, typically in open air. It is characterized by a rapid and intense flame front that propagates through a fuel-air mixture, releasing heat and producing a pressure wave. Deflagrations can occur in various settings, including industrial processes, fuel storage facilities, and laboratories.

In a laboratory setting, deflagration may occur as a result of the accidental ignition of flammable materials, such as gases, solvents, or powders. Deflagrations can pose significant risks to laboratory personnel and equipment, and appropriate safety measures should be taken to prevent their occurrence.