Dry ice is prone to white mist when it is vaporized, so the waiter who delivered the red wine saw the white mist coming out of the ice bucket, and ordinary ice does not emit such a thick white mist. Pen & Fun & Pavilion www.biquge.info

The murderer waited for the waiter to pick it up when he was ready, because he wanted to make sure that the thing could be delivered to where he wanted it in the shortest possible time.

In addition, the vaporization of dry ice requires the absorption of a lot of heat, and the fingers of the person carrying the ice bucket will definitely not be able to stand it, and will definitely send the things away as soon as possible! This also buys the murderer more time!--In other words, the sooner the dry ice is delivered to its destination, the more carbon dioxide will be released at the destination!!

So, the person the waiter saw in the service room at that time was the murderer!!

And the murder weapon was dry ice.

Dry ice, which is the solid form of carbon dioxide, is easy to vaporize at room temperature and is not easily soluble in water, of course, it can still react with water to form carbonic acid, but this reaction is still relatively weak.

In general, both water and alcohol speed up the vaporization of dry ice. Because dry ice will absorb heat when it is vaporized, if water is used, although it can be vaporized faster, it is also easy to freeze the water, and if the ice formed by the water surrounds the dry ice, the effect is counterproductive!

The killer used alcohol.

Because the freezing point of alcohol is very low, at more than 100 degrees below zero, it will basically not make the alcohol solid, so it is the best choice to use it to accelerate the vaporization rate of dry ice!

This is also the fundamental reason why there is a strong smell of alcohol in the barrel!

Carbon dioxide is colorless and odorless, and people can't feel it under normal circumstances, but as long as its concentration exceeds 6%, it can suffocate people to death. And carbon dioxide is heavier than air, and the closer you get to the ground, the higher the concentration.

As the dry ice completely vaporized, the concentration in the room became higher and higher, and in the already turbid box, people could not notice it, so before they knew it, everyone would fall into a coma due to lack of oxygen, and eventually die of suffocation.

The area of this KTV box is only a dozen square meters, and the three barrels of dry ice are enough to fill the entire space with carbon dioxide, and its concentration is far more than 6%.

Although there are also exhaust fans in the box, in order not to waste too much electricity on the air conditioner, this kind of exhaust fan is very small, not to mention that carbon dioxide is heavier than air, and it is deposited in the space near the ground, and the exhaust fan on the top does not play a role at all.

Although the window of the box was also open, the gap was very small, and the window sill was still so high that by the time the carbon dioxide had accumulated to the height of the window, the occupants of the room would have suffocated to death.

The worst part is that, in addition to people who like to sing standing up, people who entertain in the box usually prefer to sit on the couch!

I speculate that this should be the case in the box at the time:

A singing girl is standing in front of singing, the other five people are sitting on the sofa playing, the innermost two are probably flirting, the one lying on the sofa on his back should have drunk too much and is resting in a daze, the one lying on the floor between the sofa and the coffee table should be to pick up the dice that fell on the ground, he just lit a cigarette at that time, and was about to play with the second singing girl to guess the dice.

Later, because a dice fell to the ground, he stuck the cigarette in the ashtray and lay down to find the dice.

At this time, none of the six people paid attention to the three ice buckets placed on the coffee table in the box.

Under the influence of alcohol, the dry ice has been vaporized in a very short time, and it is estimated that it will not take more than five minutes to fill the bottom half of the room.

Judging by the volume of the ice bucket, the amount of dry ice put into it must be considerable.

The two flirtatious ones fell unconscious unconsciously, and the drunk one would not know that he was dying step by step. One of the accompanying singers next to him also thought that he had drunk too much and lay there not wanting to move, and the one who picked up the dice probably began to get confused when he lowered his body, and then fell to the ground and could no longer get up.

Only the woman who was standing and singing, after singing and finding that everyone was silent, looked back to see that because she was standing, she was the last to fall.

When she found out that something was wrong, she should have inhaled a lot of carbon dioxide, and she was already a little confused, and when she found that the girl next to her was unresponsive and wanted to pull, because her companion was already unconscious and her body was very heavy, she couldn't pull it at all, and her breathing was naturally a lot shorter, plus she bent over, she inhaled more carbon dioxide, and then she couldn't support it, and she knelt down as soon as her legs were weak, and the microphone in her hand rolled to the sofa!

The cigarette stuck in the ashtray was also slowly extinguished due to lack of oxygen, so when I arrived at the scene, I found the cigarette that was only one-fifth burned!

If it weren't for the lack of oxygen, the cigarette placed head-down would at least burn to the groove of the ashtray where the cigarette is used to jam the cigarette, which is not the case, so I thought there was a lack of oxygen in the room at the time!

Carbon dioxide is heavier than air and is usually deposited at the bottom of the space, emitting it very slowly, although there are air conditioners and exhaust fans in the room, but in such a small space, it is relatively closed, and it cannot be emitted for a short time.

And the murderer should have calculated a long time ago, how much space, how much exhaust, how long to die, he should have been prepared for a long time. So the ice bucket he prepared was a bit larger than the normal one.

When the waiter who found the deceased went in, the carbon dioxide in it was still very thick, so he had some difficulty breathing and his eyes were black, but fortunately he ran fast, otherwise there would be another unjust death!

After he ran away, he didn't close the door again, and it was almost an hour and a half after Qiao Yifan and they arrived, and no one dared to go in again during this time, plus the effect of the exhaust fan and air conditioner, the carbon dioxide in it had basically been dissipated, so no matter how Qiao Yifan checked it, they didn't find anything.

Since the dry ice in the ice bucket had completely vaporized, there was only a small amount of ice left, so there was not much melted water, and the alcohol mixed in it made up the situation I saw.

Because dry ice vaporization absorbs a lot of heat, the ambient temperature of the ice bucket is very low, so the ice in the bucket melts so slowly that it hasn't completely melted when I get to the site, which is why I found that there was still ice in it after eight or nine hours.

The layout, while clever, seems to me to be flawed. The murderer not only made it impossible for the police to find the murder weapon, but also perfectly created a situation where he was not at the scene.

Actually, I don't care about the clues to solve this murder case, I care most about the murderer's motives, and I have to take three innocent lives. I get a little angry when I think about it.

So, after saying this, I said to Qiao Yifan: "Now you know what to do, right?"

"This bastard is too vicious, even if those three men should die, there is no need to take the lives of three young girls!" Qiao Yifan gritted his teeth, his temples jumped violently, and his hands were clenched into fists.

"Let's go first, I was in a good mood and wanted to climb the mountain, but now you have lost even this little bit of thought!" I glanced at Qiao Yifan.

"Lao Qi, you have done me a great favor, at least finish eating before leaving!" Qiao Yifan looked earnest.

"You think I can still eat?" I sneered.

Qiao Yifan rubbed his hands, very embarrassed: "You have to let me show my heart, right?!"

"Are you afraid that you won't have a chance to eat together in the future?" I stretched, "Besides, I don't want to eat your meal either, I want to show my heart?" I glared at him maliciously, and continued: "Then investigate the identity and social background and motives of the deceased and the murderer, etc., and then tell me all the details after the case is closed!"

Qiao Yifan was very surprised, he didn't know what I was selling in the gourd, but it was hard to refuse, so he had to nod suspiciously.

I didn't pay any attention to him anymore, and beckoned Wen Jing and Hong Kaiyuan to go by themselves.

(End of chapter)