In chemical point of view, oxidation, combustion and explosion are all exothermic reactions with different reaction speeds. For such reactions to take place, it is essential that the following three components be present simultaneously in due proportions.
• Fuel: flammable vapors, liquids or gases, or combustible dusts or fibers.
• Oxidizer: generally, air or oxygen.
•Heat( Ignition Energy): electrical or thermal heat energy.