Spontaneous Human Combustion
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Wikipedia-Article "Spontaneous Human Combustion"
Spontaneous Human Combustion (SHC) is an urban legend of a person igniting without the presence of an external source of ignition.
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Characteristics
There are many characteristics that differ SHC from other forms of fire.
- The fire is never started spontaneously (i.e. the fire is never started by itself). There is always some form of ignition present around the fire.
- The fire is usually localized to the body of the victim. Furniture and appliances near the victim are usually left untouched by the fire. Little or no damage is done to the vicinity of the victim.
- The body of the victim is usually more severely burnt than in a normal house fire. The burns are, however, not distributed evenly across the body. The torso of the victim is usually very severely damaged, sometimes reduced to ashes, but the extremities of the victims are usually left untouched by the fire
- Most cases of SHC occurred indoors
- Appliances (e.g. televisions) located on top of cupboards were damaged although not burnt
Complications
Being more than 75% water, the human body does not burn very well. However, in many cases of SHC, victims' bodies were reduced to cinders. To reduce the bodies of victims to such a state, temperatures of more than 1700° C (3000° F). In modern crematoria, which have temperatures around 1100° C (2000° F), the bones are not broken down completely and have to be ground into smaller pieces.
Many murderers have tried to burn their victims (in fact, many have attempted to cover up their crimes by SHC). However, once the accelerant is burnt up, the victim will stop burning. This is true in the case of Adolf Hitler, whose body was burnt after he committed suicide. The body was still identifiable even though more than 20 litres of fuel was used.
The 'Wick' Effect
The wick effect is essentially a person burned through his own fats after being ignited, accidentally or otherwise. The clothed human body is like an 'inside-out' candle: the human fat (the fuel source) is inside and the clothes of the victim (the wick) is outside.
Experiment
Using a dead pig wrapped in a blanket and placed in a mock room, BBC set out to prove the 'wick' theory in its science television show QED. A small amount of petrol was poured on the blanket as an accelerant. After igniting the petrol, the researchers left it to burn by itself. The temperatures of the fire was regularly recorded and it was only around 800° C (1472° F). As the fire burned through the pig's skin, it melted it's subcutaneous fats, which flowed onto the blanket. Bone marrow, which also contains a high amount of fats, also contributed to the burning. The surrounding furniture was not burnt although a television placed above a cupboard had its plastic cover melted. The fire had to be manually extinguished after seven hours. The majority of the pig's body had been burnt to ashes.
SHC debunked
From the experiment, the BBC researchers explained the following characteristics of SHC:
- The fires were highly localized: the flames of the fire were less than 50 centimetres high, therefore the fire usually did not spread to furniture in the vicinity.
- The body is very severely burnt: the fire, although not very hot comparatvely, can burn for a long period of time, as shown by the experiment. It is further fuelled by the body fat of the victim, which explains why the body can burn for such a long time.
- Furniture located above cupboards burnt: the fire continously heated the air and produced a convection current. Hot air rose and caused the plastics in television set to melt.