Just when Tangze was hesitating about his speculation, he planned to wait to hear the investigation results before making a judgment.
Chiba, who was next to him, ran over in time: "Megure Police Department, I just got a piece of news during my visit, I don't know if it is related to the case.
According to interviews, many people said that many people heard explosions from the river this morning.
But because the residential area is lower than the river bottom, everyone just heard the sound but did not see what made the sound."
"Well, if it's the sound of metal squeezing, it should be from the gasoline barrel. If it's some other sound, it probably has nothing to do with the case."
Officer Memu thought for a moment and made a judgment based on the current situation.
Hearing Officer Megure's words, Karasawa frowned, instinctively feeling that the voice should be related to the case.
However, Tang Ze has not seen the whole case clearly yet, so he did not speak, but waited for the information from other people's investigation.
Not long after, Shiratori also rushed over and told his investigation: "Officer Megure, after our investigation, we have discovered the source of the gasoline barrel!"
"Really!" Officer Memu's eyes lit up when he heard this: "Where did you find the gasoline barrel?"
"Arakawa Osamu's scrap metal factory has a large number of gasoline barrels stacked with the same logo on them!"
"Mr. Arakawa, do you have anything to say?" Officer Megure looked at Osamu Arakawa and asked in a deep voice.
"I really don't know anything!"
Hearing Officer Megure's words, Arakawa Haru hurriedly defended: "Those gasoline barrels are just lying there. Even if someone steals one or two, I don't know!
Officer, you can't suspect that I am the murderer just because of this!"
"In addition, we also found signs of fire next to the oil drums."
When Shiratori heard this, he looked at the panicked man and said, "Mr. Arakawa, do you have anything to say about this?
As a factory owner, didn’t you notice that the factory was on fire?”
"I was in the office at the time. The place where I stacked non-metals was so big. How could I see it?" Osamu Arakawa defended again: "In short, the prisoner is really not me!"
"But now the facts are in front of us."
Officer Megure looked at Haru Arakawa and said solemnly: "Anyway, now Mr. Arakawa, please come back with us!"
"This" Haru Arakawa was about to defend himself when suddenly a gust of cold wind blew by. Nanatsuki Koshimizu beside him couldn't help but shuddered and immediately shrank his neck.
Seeing the funny look of Koshimi Nanatsuki shrinking his neck, a flash of light flashed across Karasawa's mind like lightning.
At this moment, all the previous clues and doubts that had been discovered were explained at this moment, and one point after another finally pieced together the whole picture of the case.
"Officer Megure, wait a moment, I already know who the murderer is in this case." Karasawa's words shocked everyone present, including Koshimi Nanatsuki.
They all obtained the information on the case together, and all the information they knew was the same.
Despite her current reasoning ability, she still doesn't know the full story of this case.
So when she heard that Tang Ze knew the truth of the case, she was instinctively surprised.
"Really, brother Karaze!?"
Officer Megure didn't think as much as Koshimizu Nanatsuki. In his opinion, it was not surprising that Karasawa could uncover the truth of the case.
After all, hasn't it always been like this?
"It's true, but in order to verify my idea, please prepare a gasoline barrel and some water-filling tools before doing so," Tangze said.
"I understand." Officer Megure nodded, then looked at Haru Arakawa and said, "Is it okay to borrow a gasoline can?"
"Of course!" Haru Arakawa said this and looked at Karasawa with an excited expression: "This criminal, you must catch the murderer!"
Hearing this, Tang Ze just smiled. When the two criminals brought the gasoline barrel over, he found two bricks and placed the gasoline barrel flat on top.
"Please put some water inside, then lock the lid and light a fire in the gap below."
After hearing Tang Ze's instructions, the criminal on the side followed his instructions.
After the buckets were filled with water and the fire was lit underground, everyone saw that Tang Ze didn't speak, so they stood with him and waited quietly.
"Look, after the gasoline barrel is heated, the water vapor inside comes out of the lid along the cracks."
Not long after, white smoke came out of the gasoline barrel. Only then did Tangze say: "The bucket is now filled with water vapor. Now please pour cold water on the surface of the gasoline barrel."
After hearing Tang Ze's words, the criminals on the side took water from the river and poured it on the hot gasoline drum.
"Bang bang bang!!"
When cold water was poured onto the surface of the gasoline barrel that was burned red by the flames, the gasoline barrel shrank instantly and began to make loud noises.
This sudden and huge movement frightened everyone present, and they subconsciously stepped back a few points before looking at the gasoline barrel.
But the gasoline can, which was originally flat on the surface, was now uneven. It felt like an adult squeezing a can, easily.
However, unlike the can, this gasoline can does not have any external force to squeeze it. It is as if it is pinched by an invisible giant and begins to be squeezed and deformed bit by bit.
"Brother Karasawa, what's going on?" Officer Megure asked stuttering in surprise when he saw this scene.
"Actually, the principle is very simple."
Tang Ze smiled and explained: "Water will turn into water vapor when heated, and its volume will expand 1,700 times.
In contrast, when water vapor turns into water, its volume shrinks to 1,700 times."
"Did you retract it instantly!?" Officer Megure heard this and asked in shock: "Can such a little water have such great power?"
"Yes, although it only contains a little bit of water, it will turn into water vapor after boiling, and the volume will expand accordingly."
Tangze said: "At this time, due to the principle of thermal expansion and contraction, the gasoline barrel will expand from the inside out.
But when the water vapor in the bucket turns back into water, the volume will shrink to one 1700th.
What actually plays a squeezing role at this time is the atmospheric pressure.
I think you all know the power of pressure. In the famous Magdeburg hemisphere experiment, even sixteen horses could not pull apart a vacuum iron ball.
This is the power of pressure.
After the water vapor shrinks, the pressure starts to squeeze the gasoline barrel from the outside."
"Senior, are you saying that the murderer used this method to kill the deceased!?"
When Koshizui Nanatsuki heard this, a flash of horror flashed in his eyes, and his face was filled with unbearable and heartfelt resistance: "This, this is simply torture."
"Yes, this is a killing method comparable to torture."
There was even a bit of intolerance and resistance in Karasawa's heavy tone: "After the murderer knocked out Kio Otaniyama, he stuffed him alive into a gasoline barrel.
After that, follow what I just said, fill it with water and then ignite it.
However, unlike us who directly water the water, the murderer waited until the gasoline barrel was filled with water vapor, and then directly used the convenient round shape of the gasoline barrel to push it into the river.
As soon as the gasoline barrel hits the cold river water, the water vapor inside immediately returns to its original state.
At this time, the principle of thermal expansion and contraction occurs, and the gasoline barrel is instantly squeezed and deformed by the pressure.
At this time, the gasoline barrel became a prison that imprisoned the deceased. Even if he woke up, it was impossible to break free from the deformed gasoline barrel and could only wait for death.
The reason why the messenger’s skin is red is probably caused by steam burns.”
"The most laborious part of this technique is to put the unconscious person into the gasoline barrel."
Koshimizu Nanatsuki pondered: "But if you lay the gasoline barrel flat, you can put people in it bit by bit.
And then rolling the gasoline barrel into the river is undoubtedly the easiest and most labor-saving way to dispose of the body."
"How much hatred does it take to kill such an old man like this!" Officer Mu Mu said with a livid face: "Brother Tang Ze, who is the murderer?"
"In fact, we can also tell who the murderer is in this case from the method of killing."
Karasawa's words shocked everyone present, but he didn't care about everyone's expressions and looked directly at Sumita Yuko and said: "Mr. Arakawa and Kitada are in their prime, and both can operate large machines.
Coupled with their identities, there is an easier and more concealed way to dispose of the body than sinking the body into the river.
The murderer would have thought of using this method only if he was a weak woman who wanted to kill Kotani Yamakio but could not easily deal with the aftermath."
After hearing Karasawa's words, everyone present unconsciously focused their attention on Sumita Yuko.
As the suspects, two grown men, Haru Arakawa and Kitada, stood with her. They took a few steps back with horrified expressions and kept their distance from each other.
I don't blame them, the reaction was so huge. After all, even a grown man would be frightened and frightened if he could come up with such a cruel method of killing.
"Stop talking nonsense, how could I be the murderer!"
Hearing Karasawa's words, Sumita Yuko turned pale, but she still kept her mouth strong and refused to admit it, "If you insist on me saying that I am the murderer, then provide evidence!"
"ginkgo."
Tangze said: "When I was checking the death of the body, I found a ginkgo fruit in the other party's pocket.
I remember that Sumita’s house also had a huge ginkgo tree, which could even be considered a landmark in the area.”
"Don't be ridiculous, there are ginkgo trees everywhere along this river, right?"
Sumita Yuko heard Karasawa's words and laughed angrily: "You can't say that I am the murderer just because he has ginkgo fruits on his body!"
"Haha, these ginkgo trees are different from the one at your house." Tang Ze smiled and said, "And it is because of this difference that it becomes evidence to identify you as the murderer."
"Huh!?"
Hearing Karasawa's words, Koshimizu Nanatsuki let out a light sigh. Thinking of the ginkgo rain before, a flash of light flashed in his mind: "There are no ginkgo fruits! There are no ginkgo trees on both sides of these streets!"
"That's right."
Karasawa looked at Koshizu Nanatsuki and cast a look that was full of hatred: "You finally have the idea.
After sweeping the ground for so long, there was no ginkgo fruit. When I saw the ginkgo fruit in the deceased's pocket, I could still tell whether it was a coincidence.
The response is too slow!”
"I'm sorry." Koshizui Nanatsuki scratched his head in embarrassment when he heard this: "But senior, I only discovered something was wrong because of your reminder just now.
But actually, I have no idea what’s behind these differences.”
"So you still have to study more."
After Karasawa finished educating Nanatsuki Koshisui, he looked at the people beside him who were hurt by his words and looked a little embarrassed but curious. He did not show off and immediately said: "Actually, ginkgo trees also have genders.
In other words, there are two types of ginkgo trees: female and male, which are the same as the gender in common sense.
Male ginkgo trees cannot bear fruit, and only female ginkgo trees can bear ginkgo fruits.
Because the fruit has a strong smell, it is not suitable as a street tree.
In other words, these ginkgo trees on the street are all male.
And the ginkgo tree in Sumita’s house, if I’m not mistaken, should be female.”
"Indeed, that tree bears a lot of fruit every year." Beitian Congming heard this and quickly agreed: "I can smell it every time I pass by."
"Me too." Osamu Arakawa nodded repeatedly.
But with two nearby people testifying, everyone no longer had any doubts about Karasawa's reasoning, and all focused their attention on Sumita Yuko.
"how so"
When Sumita Yuko heard Karasawa's words, her brain suddenly went blank, her whole body was swaying, and her face was filled with fear.
"You just married into the Sumita family last year, right?"
Tang Zedan said calmly: "So you don't know the difference between the ginkgo trees here and the one at Sumita's house.
Dr. Otaniyama may have had an ominous premonition before he died.
That’s why I picked up the ginkgo fruit that fell on me and put it in my pocket, so that even if I was brutally silenced, I could use it as evidence to identify my murderer.”
"The matter has come to this, Mrs. Sumita, do you have anything else to say?" Officer Megure looked at Yuko Sumita and asked.
"Hum female tree?"
Sumita Yuko smiled bitterly and said in a sarcastic tone: "As expected of the Sumita family, the succession of the family is their top priority."
"Why do you say that?" Officer Megure asked strangely after hearing Yuko Sumita's words.
"Actually, Dr. Otaniyama is the Sumita family's family doctor. He found that my body was unable to give birth."
Sumita Yuko's eyes were indifferent and empty: "For a prominent family that has been famous since the Edo period, I lose my role because I am infertile.
Even if my husband and I truly love each other, we will definitely be divorced.
And Dr. Otaniyama has been working in the Sumita family all his life, so naturally he will not hide this matter for me.
If my parents-in-law find out, I will definitely divorce my husband.
I love my husband very much and don't want to leave him.