Types of Burn Injury
Thermal Flash - Explosions of natural gas, propane, gasoline and other flammable liquids.  Intense heat for a very brief period of time.  Clothing is protective unless it ignites.
Flame - Exposure to prolonged, intense heat.  House fires, improper use of flammable liquids, automobile accidents, ignited clothing from stoves/heaters.
Scalds - Burns caused by hot liquids.  Water, oil, grease, tar, oil. Water at 140 degrees F, creates a deep burn in 3 seconds, but at 156 degrees F will cause the same injury in 1 second.  (Coffee is 180 degrees F just brewed).  Circumferential burns should raise suspicion of non-accidental trauma.  Tar needs to be removed either with an adhesive remover solution or petroleum based dressings.
Contact - Result from hot metals, plastics, glass or coals. Can be very deep.
Chemical Caused by strong acids or alkali substances.  They continue to cause damage until the agent is inactivated.  Alkali substances usually cause more severe injury since they react with the lipids in the skin.
Electrical Caused by either AC or DC current.  Current follows the path of least resistance and causes injury in areas other than the contact/entry site.  They cannot be judged from the external injury alone.  High voltage > 1,000 volts, low voltage < 1,000 volts and lightening.  Electrical burns are thermal burns from very high heat.
Radiological Caused by alpha, beta or gamma radiation.  They may need to have some type of decontamination done to stop the injury.