In another classroom at school, the physics teacher is talking about the concept of "specific heat capacity". In fact, in the process of forensic autopsy, there is also an application of a similar principle:

After death, the body slowly cools until it reaches the same temperature as the surrounding medium. Therefore, the medical examiner can infer the time of death of the deceased from the cold state of the corpse, which is the most commonly used and accurate method of presumption of the time of death. The method has the following derivation formula:

Time after death = (37° - core temperature of the corpse) ÷1.5° [ This formula assumes that the deceased's body temperature will automatically drop by 1.5° every 1 hour]

According to this formula, by lowering the temperature of the corpse, the value of the equation can be increased, thereby extending the time after death, so as to obtain an earlier moment of death than the actual one.

Speaking of this case, Song Kexian was not cut immediately after his death, but was dragged from a chair under the vent of the air conditioner, which was still running in refrigeration mode and the temperature was set at a minimum of 14°C. The purpose of this move was to cool down the body. It took about an hour for the body to be carried to the bed and divided. Until the next morning, Yang Yueqing entered the victim's room with the regenerated universal room card and set the air conditioner to dehumidification and ventilation mode.

It was with these few hours of cooling and cooling that the core temperature of the corpse was artificially lowered, which led to the overestimation of the time after death by half an hour, and therefore the moment of death was also misjudged - more than twenty minutes earlier. Song Kexian's real time of death was 23:05 on the 17th, not 22:40.

The police car was bumpy along the rugged mountain road, and Yang Yueqing in the car looked calm. Not because of the relief after gambling and losing, but from the satisfaction of hiding from the world.

"On the night of the 17th, my brother and his colleagues returned to the room after supper, and the time was nearly 23 o'clock. After that, he took his tools and went to room 302 to solve Song Kexian. Using the difference in corpse temperature to create an alibi is the most central ruse in this case. If the air-conditioning and refrigeration effect of our housekeeping department can be more powerful, then the time of Song Kexian's death is likely to coincide with the moment when Tian Yanlun appeared in the hotel. It's a pity that the heavens did not fulfill people's wishes, and the dilapidated equipment made this wishful thinking come to naught.

Because the air conditioner was set in dehumidification and ventilation mode, the police failed to find the "famous hall". And because the body was found 18 hours after the crime, neither the "zombie" nor the "corpse spot" could identify the fatal error.

As early as when my brother made up his mind to get rid of Song Kexian, I asked to do it instead of my brother, and I did not hesitate to threaten him with a bargaining chip to tell the police, but Xiao Wei did not give in. Because he knew me too well to know that my threats were just bluffing. For our sisters and brothers, neither of us can do anything to betray our relatives. In order to play the role of "murderer", the two of us have been arguing, and after some wrestling, both sides had to take a step back, and reached two agreements:

1. The murder was completed by Xiao Wei alone, and I did not participate, this article was proposed by my younger brother; Second, once the two of us were suspected by the police, I came forward to replace the bag, which I repeatedly insisted on. On the day of his arrest, when I was the only one left in the house, I said only eight words to him, 'Keep the agreement, and be willing to lose the gamble.'" This was followed by the howling and crying of his younger brother, and time seemed to go back to when he was a child.

The gloves that Xiao Wei wore when he opened the door of Song Kexian's room were also provided to him, and the canvas itself does not leave fingerprint marks. After the incident, I deliberated over and drew up a set of confessions between the two of us in case of a goof. The subtlety of this confession is that most of the content is true, but the most critical core part is stolen. In this confession, I deliberately left a gap of 5 minutes. In fact, after I came out of the complainant's room that night, I stuffed the 302 room card into my brother's room, and I really went to the bathroom on the first floor for the remaining three or four minutes. Although in the eyes of the police, this blank schedule has become a suspicious point. This suspicion was perfectly matched with the ruse of 'cooling the corpse', and I was considered the murderer in this case, as I wished.

That night, the person who was scratched was also a little maid. When I heard the news, I decided to do what I wanted, and the next day I deliberately wore long sleeves in order to act in front of my old classmates.

By the way, when I poured alcohol into the jar containing Song Kexian's body parts, I secretly added some acid to it, so that the dandruff DNA left in the nails of the corpse would be destroyed due to the low pH level and could not be extracted for testing. My brother's incriminating evidence is gone forever, and he doesn't have to accompany me to death.

Considering that Xiao Wei is an accomplice and has a meritorious service of taking the initiative to confess, and counting the commutation of the sentence, he will not be able to squat in the number for a long time, which is what Miao Yixin promised me. Speaking of Miao Yixin, I feel a little sorry in my heart. I had to set up a bureau for him for the sake of my loved ones, and he jumped in without knowing it, ashamed. I'm afraid I'll have to wait until the next life to make up for it. ”

The police car finally stopped at the destination, and when she got out of the car, Yang Yueqing inadvertently glanced at the burning clouds in the sky. The remnant sun is like blood!