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Text Chapter 1165 Cause of Death

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    Yang Luo stood there looking down, with no scars on the surface.  Then he slowly squatted down. Since Li Zuoqun was lying on his side, his upper body, chest and face were almost touching the ground. No wounds could be seen. However, based on his experience, Li Zuoqun should have been pierced in the heart with a sharp weapon, or  The main artery in the throat was cut, otherwise there wouldn't be so much blood on the ground.

    Huang Pingyi and Zheng Damin saw Yang Luo checking the body and hurried over.

    Zheng Damin asked: "Secretary Yang, do you see anything?"

    Zheng Damin had heard about Liu Hai¡¯s death case, especially the professional knowledge contest between Yang Luo and Sun Yunfeng at that time.  Later, he personally inspected Liu Hai's body, and he didn't see the symptoms Yang Luo mentioned.  While waiting for the results of the forensic autopsy, He Dabao suddenly surrendered, letting the truth come to light. Zheng Damin had to admire Yang Luo from the bottom of his heart.

    He is the director of the county public security bureau. Yang Luo was also the director of the county public security bureau. In terms of professional knowledge and super logical reasoning ability, there is really a world of difference.  So when he saw Yang Luo checking Li Zuoqun's body, he hurriedly came over to ask.  After all, Li Zuoqun was the secretary of the county party committee. He died suddenly. Whether it was murder or an accident, as long as the cause of death was not investigated for a day, he would be under great pressure.

    Yang Luo did not answer him, but touched the blood on the ground with his fingers.

    "Depending on the degree of blood coagulation, death should take between one to two hours." After speaking, he picked up the Coke in Li Zuoqun's hand, shook it, and poured it out a little. There was still ice.

    At this time, the criminal policemen who were inspecting the scene also gathered around. A middle-aged man who was nearly forty years old and held the rank of third-level police inspector looked at Zheng Damin doubtfully.

    "Director, this is"

    Zheng Damin raised his finger and shushed, and the middle-aged man shut his mouth.

    Yang Luo was lost in thought while holding the Coke, put the Coke back in its place, then stood up and said, "Director Zheng, have you checked the wounds on the body?"

    Zheng Damin nodded: "The wound is in the throat. It seems that some sharp instrument penetrated the aorta."

    Yang Luo nodded, squatted down again, and turned Li Zuoqun's body over. He saw a deep penetrating wound more than an inch wide in Li Zuoqun's throat.  Then he picked up Li Zuoqun's other hand and checked it, then stood up again after a while.

    "Did you find anything?" Yang Luo looked at Zheng Damin and the middle-aged man.

    The middle-aged man asked: "What are you referring to?"

    Yang Luo said softly: "Just pull the ring."

    The middle-aged man was stunned: "I didn't see it."

    Yang Luo pursed his lips, walked to the refrigerator, and opened the refrigerator. There were some vegetables in the refrigerator, but nothing else.  Yang Luo opened the freezer again and saw a can of Coke still frozen inside.  I took it out and squeezed it with my hands. It was as hard as a stone and had obviously been frozen solid.

    Yang Luo threw the Coke back and closed the refrigerator door. He lowered his head and looked at the ground next to the refrigerator. There was also a box of Coke, but it was not in cans, but in plastic bottles.

    Yang Luo lifted the Coke box with his feet, then looked up at the woman who was still crying.

    "Are you Secretary Li's wife?"

    The woman sobbed and said, "My name is Tang Huizhen."

    Yang Luo asked without any expression on his face: "When did you find out that something happened to Secretary Li, and where were you at that time?"

    Tang Huizhen said: "I went out to buy groceries at four o'clock. When I came back more than an hour ago, I saw something happened to Lao Li, and then I called the police."

    Yang Luo asked: "Secretary Li likes to drink Coke? And it's iced?"

    Tang Huizhen nodded: "Old Li said drinking Coke can refresh you, especially ice Coke."

    Yang Luo didn¡¯t ask any more questions, but looked at Zheng Damin: ¡°Have you notified the forensic doctor?¡±

    Zheng Damin said: "Notice." After speaking, he looked at his watch and said, "It should be here soon."

    Yang Luo took out a cigarette, lit one, took a deep puff and said, "Wait a moment!"

    Huang Pingyi asked: "What did you see?"

    Yang Luo smiled slightly: "Let's wait until the forensic doctor comes over."

    Huang Xinxin couldn't help but said: "Boss, I can tell by your expression that you must have discovered something. Tell me quickly."

    Yang Luo shook his head: "I'm not sure either, I'd better wait until the forensic doctor comes."

    Although everyone present wanted to know what Yang Luo discovered, there was nothing he could do if he didn't tell him.

    Zheng Damin asked: "Captain Han, do you have any clues?"

    Han Gengqiang said: "No!"

    At this moment, two men in white coats walked in outside.The women, the older one in their thirties and the younger in their mid-twenties, were carrying a metal box in their hands.

    When Zheng Damin saw the woman, he hurriedly said: "Xiao Liang, you are here."

    Liang Minjia nodded expressionlessly, squatted down next to Li Zuoqun's body, and checked Li Zuoqun's body.

    "Except for the throat, there are no obvious injuries." After speaking, he raised his hand and said, "Ni Ni, give me the evidence collection box."

    The girl standing next to her placed the metal box on the ground and opened it.

    Liang Minjia put on gloves, then took out a scalpel and cut open the wound on Li Zuoqun's throat. A bright metal object was exposed.

    Liang Minjia took the tweezers again and took out the metal object. It turned out to be a pull ring for a can of Coke.  Everyone was stunned when they saw it, and then they all looked at Yang Luo.  Just now, Yang Luo had been looking at the Coke in Li Zuoqun's hand, and even asked the middle-aged man if he had found a ring.  It seemed that he had known for a long time that the wound on Li Zuoqun's throat was caused by a pull ring.  But how is this possible? How could Li Zuoqun be killed by pulling the ring?

    "How could this happen?" Liang Minjia looked at the pull ring on the tweezers and muttered softly.

    Yang Luo glanced at the bloodstained Yi Lahuan, called Huang Xinxin, and walked out.

    Zheng Damin was anxious: "Secretary Yang!"

    Yang Luo stopped: "Is something wrong?"

    Zheng Damin said awkwardly: "Secretary Yang, you should know what's going on."

    Yang Luo nodded: "Yes, but so what? Investigating the cause of Secretary Li's death is your police's business, and it seems to have nothing to do with me."

    Zheng Damin felt even more embarrassed and cursed in his heart: "Damn it, if I knew how the ring got into Li Zuoqun's neck, why would I ask you?"

    Huang Pingyi said helplessly: "Tell me, what are the conditions." If the cause of Li Zuoqun's death is not clear, his life as the county magistrate will not be easy.

    Yang Luo grinned when he heard Huang Pingyi's words: "Secretary Li had an accident, but some things cannot end because of the death of certain people."

    Huang Pingyi's face was full of dark lines. He understood the meaning of Yang Luo's words. After Li Zuoqun died, the superiors would definitely put aside the investigation of Li Zuoqun.  Yang Luo didn't want to let Li Zuoqun go just because he was dead, but asked the higher-ups to investigate.  But this kid didn't want to cause trouble with his superiors because of the investigation into Li Zuoqun, but asked him to come forward.

    Huang Pingyi gritted his teeth and said: "If the city really stops the investigation, I will write a report and submit it, but if the city doesn't agree, there is nothing we can do."

    Yang Luo smiled: "You are the county magistrate. As long as you submit the application, I think the city will definitely consider your opinion. Then I will work harder and this matter will continue."

    Huang Pingyi gritted his teeth with hatred and cursed secretly, this little fox is really cunning, he actually pulled him into the water.

    Yang Luo didn't look at Huang Pingyi's eyes that could kill him, but glanced around: "Are you wondering how a pull ring could get into Secretary Li's neck?"

    Everyone nodded in unison, even Liang Minjia nodded quickly.  She has been a forensic doctor for seven or eight years and has never encountered such a bizarre thing.  In fact, not only him, Zheng Damin has never met him.

    Yang Luo said: "Then I will teach you a lesson." After speaking, he took a puff of cigarette, "The lower the temperature is below 4 degrees Celsius, the larger the volume of water. The drastic change in the volume of Coke occurs during the freezing process. Because  The density of ice is 0.917g/cm³ and that of water is 1g/cm³, so the volume expands by about 9% after freezing. Although Coke is not pure water, it is not much different from this number.

    The freezing point of pure water at standard atmospheric pressure is 0 degrees Celsius.  When various solutes are dissolved in water, the freezing point decreases.  The freezing point of cola is about 30 degrees Fahrenheit (about -1.1 degrees Celsius).  This is Coke after opening the can. The freezing point of sealed cans of Coke will be lower due to the high internal pressure.  However, the freezing point decrease due to pressure changes is not significant.

    There are also changes in carbon dioxide gas. Carbon dioxide gas is dissolved in cola.  Therefore, the internal pressure of unopened cans of Coke is higher than atmospheric pressure.  The internal pressure of a can of Coke is 117 kPa at 4 degrees Celsius and 248 kPa at about 21 degrees Celsius.  380 kPa at 24 degrees Celsius.  For comparison, atmospheric pressure is 101 kPa.  In other words, the pressure of refrigerated Coke is slightly higher than atmospheric pressure, which is about 2-4 times that of atmospheric pressure at room temperature.

    Therefore, the solubility of carbon dioxide in water is that the lower the temperature, the higher the solubility.  Cooling will promote the dissolution of carbon dioxide and reduce the air pressure in the tank.

    But after the cola starts to freeze, a large amount of carbon dioxide will be released.  Because gas does not dissolve in ice.  These??The carbon dioxide released greatly increases the pressure inside the tank.  According to Boyle's law, the pressure of a gas is inversely proportional to its volume at the same mass and temperature.  Canned Coke generally contains about 3-3.7 times the volume of carbon dioxide dissolved in 355 mL, which means that the volume of this carbon dioxide under standard atmospheric pressure is about 1L.  When they are released in a sealed jar, since most of the volume in the jar has been occupied by ice cubes, the volume of the gas is compressed very small, and the pressure will naturally be very high.  The specific size is related to complex factors such as the deformation of the can and the freezing condition of the Coke, which cannot be estimated.

    These gases are compressed to 5% of the standard atmospheric pressure, that is, 1L of gas is compressed into 50mL. Considering the volume of the jar and the internal ice, their pressure at this time is 20 standard atmospheres.

    A Coke can is designed to withstand a pressure of 100 PSI, which is 689.5 kilopascals, close to 7 atmospheres.  Coke stored under normal circumstances usually only has an internal pressure of two or three atmospheres, so this strength is sufficient for normal use.  But under extreme conditions of freezing, a frozen can of Coke is no different from a bomb.  "

    Having said this, Yang Luo took a last puff of cigarette and then threw the cigarette butt on the ground: "Look at the Coke can in Secretary Li's hand. It has deformed and the bottom is even more protruding. It can be seen that the pressure of this Coke has exceeded  20. So when Secretary Li touched the pull tab, the pull tab was ejected by the strong air pressure, and by chance, it hit Secretary Li's throat. "

    The police inspector said: "In other words, Secretary Li died accidentally?"

    Yang Luo smiled slightly and walked out: "Whether it was an accident or not, only you can find out through in-depth investigation. Don't draw conclusions prematurely."
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