Rebirth 78, the beginning of the marriage was broken off by the female educated youth

Hearing this, everyone subconsciously looked at the ground.

There, the gas that had just flowed out of those glass bottles had just escaped.

After realizing that it was those gases that caused Shen Yujing to suffer such severe and almost life-threatening poisoning symptoms, everyone subconsciously stepped back.

Wang Hebing, He Yongweiting, Wen Xianping and Fei Yiqing all frowned and looked at the ground without saying a word.

On the contrary, Wei Jingfei, who had been silent since entering and was confused about the situation, exchanged glances with his team leader Guo Qian several times with interest, and then asked, "Advisor Li, are you saying that this gas is the culprit that caused Shen Yujing's poisoning? Is this thing... the zinc phosphide you mentioned yesterday?"

"Yes! Xiao Li, is this thing zinc phosphide?" Lu Dingkun asked, scratching his head.

The interaction between the three of them made everyone around them stare at Li Xiangnan with wide eyes, wanting to know the final answer.

But soon, they found that Li Xiangnan shook his head.

"No, this thing is not zinc phosphide!" Li Xiangnan said calmly.

"Isn't it zinc phosphide?" Doctor Liu Yishou, who had his hand raised and his sleeve covering the outside of his mask, asked in confusion, his tone still a little vague.

Wang Defa grinned through his mask and said, "Oh my god, is there any other substance?"

Li Xiangnan nodded, stood up, and picked up the glass bottle where the experiment had just taken place with tweezers, and gestured:

"Zinc phosphide itself is a solid powder, but it has a fatal characteristic—it decomposes when exposed to water or acid. That's the purpose of my experiment just now! I want you to witness the process of it transforming from a solid to a gas!"

Wang Defa suddenly realized: "In other words, when it comes into contact with water and acid, it turns into gas and is no longer zinc phosphide?"

Everyone couldn't help but stretch their heads and look hard at the glass bottle to see if there were any solid ingredients inside.

"That's right! Solid particles of zinc phosphide, when exposed to water and acid, produce highly toxic and flammable phosphine (PH3) gas! This phosphine gas has several very obvious properties: it's responsible for the garlicky smell, its intense irritation, and its lethal toxicity. As for why it flowed like water across the table and floor after the reaction, it's because its specific gravity is slightly greater than air. Once formed, it tends to accumulate in low-lying, poorly ventilated areas."

"Water flows to low places, and phosphine gas will also flow to low places!"

"Ouch!"

When Li Xiangnan gave these explanations, the entire laboratory was in an uproar, but also everyone suddenly understood.

"So that's how it is!" Wang Hebing finally understood the principle of Shen Yujing's poisoning.

Seeing that He Yongweiting's face was still ashen, he was excited and couldn't help but comfort him: "He Jian, Wei Jian, now that we understand the principle, we are not far from the truth. There is no rush!"

"No hurry, no hurry!" He Yong smiled awkwardly, but subconsciously wiped the sweat from his forehead and looked at Wei Ting.

Both of them had the same expression.

Guo Qian hasn't sat down since Wei Jingfei came back.

Now they are just one step away from uncovering the truth. As the captain of the criminal investigation team, he and Li Xiangnan have a tacit understanding based on their years of cooperation. That is to take the opportunity to observe the reactions of everyone present.

At this time, whoever feels the most guilty is most likely someone related to the murderer!

And his gaze lingered on He Yong and Wei Ting many times.

"Doctor Li, I never thought that as a doctor, you are not only an excellent doctor, but also proficient in investigating cases and solving clues. You even have a thorough understanding of physics and chemistry. You are truly a rare talent!"

Dr. Wang Dong, who had always been calm and composed in the crowd, was stroking his beard at this moment, and he was very impressed with Li Xiangnan's reconstruction of the principle of Shen Yujing's poisoning.

Wang Defa, standing by, couldn't close his mouth. He chuckled twice and sighed, "Old Dean, you don't know this yet, right? There's a saying that goes, 'If you don't know Li Xiangnan, you'll have traveled all over Beijing in vain!'"

"Oh?" Wang Dong exclaimed in surprise, unable to help but repeat, "If you don't know Li Xiangnan, it's useless to travel all over Yanjing. Good explanation, good explanation, hahahaha!"

Liu Yishou savored these words, then nodded heavily, with Li Xiangnan's shadow imprinted in his eyes, as if he wanted to remember him.

The discussions, cheers and praises at the scene soon subsided because there was still a very critical issue that had not been resolved.

"Advisor Li!"

Someone shouted, and everyone turned their heads to look and found that it was not Political Commissar Wang who asked the question, but Section Chief Wen Xianping, who had been calm all the time.

"Liberal arts, you say!" Li Xiangnan looked at him.

"Now that you've found the poison and the mechanism, how did Shen Yujing get poisoned? And how did it happen that it avoided the other prisoners and only targeted him?"

This question is extremely crucial. Wen Xianping had not said anything just now. He had been watching, observing and thinking. Now that he knew all the prerequisites, what he wanted to know most was how all this happened.

This question is also a major issue that needs to be solved urgently after resolving everyone’s previous doubts!

"Senior Wen asked a very good question!"

Li Xiangnan nodded and waved outside, "Comrade, please bring in the wooden planks I requested!"

Everyone looked at the door in confusion, and soon a wooden board was carried into the room by two prison guards.

Li Xiangnan asked them to place the wooden board on two stools to form a simple "teaching blackboard".

After finishing, Li Xiangnan began to write and draw on the blackboard. After a few minutes, a sketch slowly appeared in front of everyone.

"See this circle of hills? This is the general environment of Qincheng Prison. Our prison is located on the eastern slope of Yanshan Mountain. The entire west is surrounded by mountains, while the east, north, and south are vast plains!"

Wei Ting wiped the sweat from his face and asked, "Advisor Li, what does this have to do with our case?"

Hearing his words, Li Xiangnan smiled slightly, "Don't worry, Wei Jian, it will be related soon!"

Then he smiled and said immediately, "Because Shen Yujing's cell faces the mountains to the west!"

"..."

Hearing this, not only Wei Jian, but everyone subconsciously frowned.

Shen Yujing's cell faces the mountains. What does this have to do with the case?

"Yesterday evening!" Li Xiangnan began to draw raindrops on the east side of the wooden board. "Qincheng Prison had a short, heavy rainstorm! It rained for two hours..."

"hiss!"

Hearing this, Fei Yiqing, who told Li Xiangnan the news that it was going to rain, couldn't help but take a breath. He originally thought that the other party was just chatting, but he didn't expect that a casual remark would become a key part of Li Xiangnan's solving the case.

"But what does the rain have to do with our case?" He Yong wiped the sweat from his forehead and couldn't help asking.

"Of course it does matter!"

But Li Xiangnan's face no longer had a relaxed expression. Instead, he coldly tapped the wooden board with chalk.

The knocking sounds were like the thunder in the thunderstorm yesterday evening, striking everyone's heart one after another.

Li Xiangnan shouted, "It was the arrival of that torrential rain that triggered a chemical reaction in the two kilograms of zinc phosphide rat poison that the murderer had spread outside Shen Yujing's ventilation window. The rain and the zinc phosphide rat poison began to react, and the rapidly forming phosphine poison gas, due to the special geographical location of Shen Yujing's cell, was affected by the combined effects of the mountain and the rain. Under the extremely special atmospheric pressure, it rushed from the high-pressure outside the prison into the low-pressure cell. Within two hours, the entire cell below the height of a person was filled with poison gas!"

"When Shen Yujing returned to his cell after the interrogation before the hotel arrived, he was immersed in an atmosphere filled with poisonous gas. He sat down at his usual dining table. After a few minutes, without even eating, he collapsed to the ground. The loud crash, mixed with the sound of the plate hitting the ground, caught the attention of the prison guard on duty!"

"This is the whole truth about Shen Yujing's poisoning!"

"???"

After hearing Li Xiangnan's almost miraculous reasoning and explanation, everyone stood up and stared at the diagram he drew on the blackboard in horror. They were stunned and speechless for a long time. Everyone was shocked...