This is probably the most desperate way to die. In 1999, seven Frenchmen were roasted for 53 hours by a fire at 1200°C in a fire shelter. By the time rescuers arrived, the 7 trapped people had been roasted into "jerky."
In 1999, a wagon carrying 9 tons of edible butter and 12 tons of flour was driving in the Mont Blanc Tunnel on the border between Italy and France. When the truck drove to the middle of the tunnel, about 6 or 7 kilometers, the driver saw in the rearview mirror that the rear compartment was emitting thick black smoke.
The driver immediately stopped the van and pulled out a fire extinguisher to try to extinguish the fire, as the truck was loaded with flammable flour and cooking butter. The fire extinguisher in the driver's hand did not work at all, and he quickly gave up fighting the fire, abandoned the car and fled.
The fire spread rapidly, causing the temperature in the tunnel to rise rapidly, and the fire also burned off the power supply line for lighting, coupled with the smoke generated by the fire burning, the tunnel was dark and could not see five fingers.
People in the tunnel abandoned their cars and ran to the exit, but the people in the middle of the tunnel, because they were too far from the exit, fell into smoke and fire on the way to escape.
However, there were 7 people with a strong sense of survival, who found the fire shelter in the tunnel and hid inside. They thought it would be safe to wait for rescue, but they didn't know that this was the beginning of the tragedy.
After 53 hours, the fire was finally extinguished, and by the time the tunnel cooled to an entry point, it was five days later. When rescuers entered the tunnel, they found that not only had all the vehicles been burned, but even the asphalt on the ground had been burned.
As for the 7 people who hid in the fire shelter, they were not killed by fire or suffocated by smoke, but were completely roasted by the high temperature.
At that time, the design standard of the fire shelter in the tunnel was that it could withstand a fire of 800 ° C and about 4 hours. But this time, the fire in the Mont Blanc tunnel lasted for 53 hours, and the temperature reached 1000 ° C.
The fire at 1000 ° C continues to bake the fireproof shelter, the heat wave is continuously transmitted through the wall to the room, and the temperature in the room can reach hundreds of degrees Celsius, which has long exceeded the limit of the human body.
What is the limit of the high temperature that the human body can withstand?
Some experiments have found that if it is impossible to dissipate heat through perspiration evaporation, people's ability to withstand high temperatures in water is significantly lower than that of heat in dry air.
Scientists have experimented with the maximum temperature that a human body can tolerate in a dry air environment.
The human body can hold on to a full hour in a 71 ° C environment, at which time the headlights will be baked.
At 82 ° C, it can last for 49 minutes, and the computer's CPU can no longer be carried.
At 93 ° C, it can be insisted on for 33 minutes, and the body temperature of the human body can already be sterilized.
At 104 ° C, it can only last for 26 minutes, and at this temperature, the water has become gas.
From this, we can see that the human body can persist for less than half an hour in a high temperature environment of 100 degrees Celsius. Even if people can tenaciously survive from such a high temperature environment, it will cause irreversible damage to the human body.
In the extreme heat environment, what reactions will occur in the human body
1, the human body in the extreme high temperature environment, the body will be "self-cooling"
In order to be able to adapt to the high temperature of the external environment, the human body has two main ways: sweating and breathing.
In the case of temperature reaching 30 ° C, the human sweat glands begin to start, and "self-cooling" is carried out by excreting sweat to achieve the purpose of regulating body temperature.
If the external environment continues to rise, when it reaches 38 ° C, the body's heat dissipation system is fully activated, the sweat glands are sweated in large quantities, and the blood vessels on the surface of the skin are also expanded to increase the heat dissipation effect.
Once the temperature outside exceeds 40 ° C, the lungs of the human body are rapidly panting, and each gasp will take away the heat in the body to achieve the effect of helping to dissipate heat; the heart also beats rapidly, transporting a large amount of blood to the surface of the body to participate in heat dissipation.
2, the human body in the extreme high temperature environment, the body's heat dissipation system will fail
As the temperature of the external environment becomes higher and higher, the heat dissipation efficiency of the human body is limited, and if it exceeds this limit range, the human body heat dissipation system will be crushed by the high temperature.
The first is that the perspiration system is shut down, it is impossible to carry out normal perspiration and cooling, the body temperature gradually rises, and the body will become hot. Under the dual action of external high temperature and internal heat, it will affect the brain of the human body and cause people to become unconscious until they lose consciousness.
If the temperature rises very quickly, the human central nervous system and circulatory system will also be impacted, and other organ systems will also be irreversibly harmed.
The human body can withstand the high temperature of the external environment, but it is difficult to withstand the limit of its own body temperature
We know that when measuring human body temperature, the thermometer is usually placed in three places in the human body: the mouth, armpits and rectum.
The normal temperature of the human oral cavity is 36.3 °C - 37.2 ° C; the temperature of the armpit is 36 °C - 37 °C; and the temperature of the rectum is 36.6 °C - 37.8 °C.
Under normal circumstances, the human body temperature is around 36 ° C. For the human body, the body temperature of 40 ° C is a dangerous signal, body temperature of 42 ° C will lead to damage to human organs, the function of the central nervous system is seriously disrupted, and even death.
Therefore, the maximum limit of human body temperature is 42 ° C, and the thermometer that measures body temperature is also up to 42 ° C.
So what is the minimum limit for human body temperature?
Under normal circumstances, the external temperature at 20 ° C will cause a decline in human body temperature, when the human body temperature drops to 30 ° C, it will lead to hypothermia, loss of consciousness, body temperature reaches 29 ° C, the pupil dilates, the heartbeat will stop.
However, Anna Baggenholm is an exception. In 1969, while skiing, she accidentally fell into an ice river and was trapped for 2 hours, and her body temperature dropped to 13.7 degrees Celsius and she was still alive. This is currently the lowest known body temperature record in the world.
Say at the end
In fact, the human body's feeling of "heat" does not only come from the external high temperature, humidity, wind and other factors will also affect people's heat tolerance limit.
For example, in high temperature and high humidity environments, because the moisture in the air tends to saturate, although the human body will sweat, the sweat will not evaporate, but stay on the surface of the skin, and it will not be able to take away the heat.
In extreme humid conditions, the human body can only endure for 10 minutes in a high temperature environment of 60 ° C.
People often explore the mysteries of life, in fact, our human body and the natural environment are inseparable, under different environmental factors, the human body can withstand the limit temperature is not the same.