$ Chapter 202 Akikawa Kongsuke’s Techniques (22)

‘That call wasn’t made by the kid… That call wasn’t made by the kid!! ’

Masumi Sera was shocked when she realized this.

She immediately guessed that the mysterious man who saved her and drove Vermouth away must have picked up the voice changer and called the house.

Although Masumi Sera didn’t hear what the person on the other end of the phone said.

But she was able to roughly guess what the other party said through Vermouth’s answer.

‘Since that person was able to pretend to be Kunio Koizumi to scare Vermouth. ’

‘Then he must be someone who has been involved in this dismemberment case. ’

‘Besides me and the kid, and the police in Kanagawa Prefecture, there is only one person left who has been involved in the dismemberment case——’

‘That is Akikawa Sosuke, who was the first eyewitness and watched the whole process almost bystander! ’

Masumi Sera felt her heart begin to pound in her chest.

The more she thought about it, the more frightened she felt.

Because she had a premonition.

If I continue to think about it, it is very likely that all my previous judgments about Akikawa will be completely overturned.

‘When Koizumi Kunio said that his family was threatened and a policeman was killed by the organization, Akikawa happened to be at the door of the room. ’

‘Could it be that he judged that the person threatening Koizumi Kunio might be the murderer of his mother? ’

‘Come to think of it, when Chianti was on the phone, he also added a sentence, "Even if you have been on the run for more than ten years, we can find you." ’

At that time, Sera Masumi thought that the person on the other end of the phone was Conan, so he didn't think much about it.

Now think about it.

If the person on the other end of the phone was Akikawa Sosuke.

Chianti's remarks undoubtedly equated himself with the murderer who killed Akikawa Ryoko.

Sera Masumi even dared not imagine it.

If it was really Akikawa Sosuke on the other end of the phone.

How angry he would be when he heard Chianti's remarks.

‘Think about it again, if that person is really Akikawa, what is the purpose of his calling in? ’

‘Is it to confirm the identity of Kunio Koizumi’s trading partner…? ’

Just as Sera Masumi was thinking in her heart, she suddenly felt nauseous again.

Because she ran out halfway through the treatment, Sera Masumi was still in the state of hydrogen sulfide poisoning at this moment.

Sera Masumi hurriedly reached out and pressed the inside of her forearm, about three fingers above the wrist crease.

This is the Neiguan point.

By pressing the Neiguan point, the urge to vomit can be relieved.

At the same time, Sera Masumi suddenly felt a flash of inspiration in her mind.

Her eyes were much brighter.

‘I thought of it! ’

‘The onset of hydrogen sulfide takes time, and the purpose of Akikawa’s call is to delay time! ’

‘If Akikawa hadn’t called at that time, Vermouth would have taken me and the computer out of the room directly. ’

‘Akikawa pretended to be Kunio Koizumi to call in to avoid this situation! ’

After figuring out all this, Masumi Sera stood up suddenly and ran into Kunio Koizumi's room.

Conan, who was originally sitting on the sofa, was also startled by Masumi Sera's sudden reaction.

"Ms. Sera, what's wrong with you?!"

Conan shouted, and hurriedly ran after Masumi Sera.

The police from the Identification Division and the criminal police from Kanagawa Prefecture were investigating Kunio Koizumi's room.

They were all shocked when they saw Masumi Sera rushing in.

Masumi Sera didn't want to explain to them, but asked anxiously:

"Have you measured the concentration of hydrogen sulfide in the room?"

"0.001%, which is normal."

A policeman answered.

Masumi Sera was slightly surprised when she heard this, and then she turned her unique deep green eyes and observed everything in the room.

'All the windows were opened. '

'The air conditioner was also adjusted to the highest temperature and the wind speed was also adjusted to the maximum. ’

‘There are also several traces of fighting. ’

After confirming the state of the room, Sera Masumi almost instantly confirmed that his previous judgment was not wrong.

At the same time, he also deduced the method used by Akikawa Sosuke to poison everyone in the room.

‘Akikawa could only generate hydrogen sulfide after I hid in Koizumi Kunio’s room. ’

‘He did not have the conditions to generate hydrogen sulfide in the room in advance, and he did not know that we would enter Koizumi Kunio’s room later. ’

‘After we entered the room, the door connected to the first floor hall was also in a closed state. ’

‘The only way for hydrogen sulfide to pass through was the ventilation hole at the bottom of the wall connected to the courtyard. ’

‘Hydrogen sulfide is heavier than the atmosphere, and in the absence of wind and rising air, it will sink to a lower place. ’

‘The private hot spring outside Koizumi Kunio’s room requires a flight of stairs to go up, so the terrain of the room is lower than the courtyard of the private hot spring. ’

‘Then Akikawa only needs to generate hydrogen sulfide gas in the courtyard, and the hydrogen sulfide gas will naturally sink to the position of the room. ’

‘According to the structure of the Kosenan Hot Spring Hotel, the balcony on the upper floor is located above the private hot spring.’

‘Although the private hot spring below cannot be seen from the balcony, it is possible to throw the container into the yard. ’

Now that hydrogen sulfide gas is available, the next step is to get hydrogen sulfide into the room.

Although there is a vent in the room that connects to the yard, hydrogen sulfide gas does not necessarily enter the room through the vent.

‘I remember that the air conditioner was turned on in the room. ’

‘Because the room is heated, the temperature inside the room is higher than that outside, so the air pressure inside the room is lower than that outside. ’

‘Since air flows from the "high pressure area" to the "low pressure area", the hydrogen sulfide gas that sinks in the yard will be driven by the air and enter the room through the vent. ’

‘After that, Akikawa called and dragged Vermouth and Chianti into the room, waiting for the hydrogen sulfide concentration in the room to rise, and waiting for the symptoms of hydrogen sulfide poisoning of Chianti and others to gradually worsen. ’

‘This is Akikawa's method. ’

‘He used the "pressure balance" property of the air to complete the operation of poisoning everyone in the room. ’

‘The reason why no hydrogen sulfide gas was detected in the room was that Akikawa once again used another characteristic of air flow—’

‘The property of “density change”. ’

‘After Vermouth and Chianti escaped, Akikawa adjusted the air conditioning temperature and wind speed in the room to the maximum. ’

‘The purpose of this step is to further increase the temperature of the air in the room. ’

‘When the air is heated, the air molecules gain energy, move faster, and expand in volume, so the number of air molecules per unit volume decreases, that is, the density decreases. ’

‘Due to the decrease in density, the hot air becomes lighter than the surrounding cold air, so it rises. ’

‘At this time, Akikawa opened the window, allowing the rising hot air to “escape” from the room. ’

‘So the hot air will drive the hydrogen sulfide that has sunk to the bottom, leave through the window, and quickly dissipate in the outside air. ’

‘Hydrogen sulfide enters the room from the yard, and leaves the room to the yard. ’

‘This is a technique that can only be completed if the terrain, temperature, and room conditions are met at the same time. ’

Sera Masumi was full of surprise.

Even though she had seen many cases with sophisticated methods, she couldn't help but be amazed by Akikawa Sosuke's operation.

It's not Akikawa Sosuke's method that's strong.

It's that Akikawa Sosuke thought of all this based on the memory of being taken to the door of Koizumi Kunio's room yesterday afternoon for a few minutes.

'Sure enough... the boy's initial judgment was not wrong. '

'This Akikawa, whether in terms of brain or observation, is far beyond ordinary people! '

Originally, Sera Masumi was still worried that Conan's judgment was correct, and Akikawa Sosuke was really a threatening criminal genius.

However, today, after being convinced that Akikawa Sosuke did have abilities far beyond ordinary people, Sera Masumi no longer had such worries in her heart.

'Akikawa didn't need to open the window and increase the temperature and wind speed of the air conditioner. '

'He did all this just because I was still in the room. '

Sera Masumi lowered her head slightly, and her black bangs covered her eyes, but it couldn't hide the smile overflowing from the corners of her mouth.

Although there are still many things that she has not figured out in her mind, she is no longer worried because she knows Akikawa Sosuke's ability.

Because——

Akikawa Sosuke really wants to save himself.

Since hot air has a lower density, according to the Archimedean principle, it will be subject to the upward buoyancy, causing the hot air to rise.

Cold air has a higher density and is more affected by gravity, so it is easier to sink.

The basic principle of air flowing from high-pressure areas to low-pressure areas mentioned in the article is pressure gradient force.

Pressure gradient force refers to the force acting on the air due to pressure differences.

Air always flows from high-pressure areas to low-pressure areas in an attempt to achieve pressure balance.

This force is one of the main driving forces for the movement of fluids (including air).

(By the way, the part that explained in detail the murder principle of bath agents was deleted by the review)