"No matter how airtight the room is, it's leaking. If some flammable gas was introduced a few days ago, it would have been dispersed anyway." Bai Song said, "Yao's personal situation definitely rules out suicide. There are no gas tanks in his room. So if you want to have enough explosives, you need enough flammable gas or particles."
"If you're talking about grains, this room is just for accommodation and there's no flour or anything like that," said Wang Huadong.
"Hmm," Bai Song took out a pen and started analyzing on the paper.
The room has a volume of more than 30 cubic meters. Even if the gas does not need to be filled in every corner of the room, the amount of combustible gas required is at least five times that of those hydrogen balloons.
"Could it be possible that the balloon contains something other than hydrogen?" Wang Liang asked, "Could it be possible that other gases have a lower explosion limit?"
"Impossible." Wang Huadong shook his head. "There is only so much gas that can carry a balloon up. It's impossible."
"That means there are other gases present." Bai Song said, and then continued: "Or particles."
"Will the cake be filled with flour?" Wang Liang had another sudden thought.
"You can't light a bag of flour at home. The flour must be evenly distributed in the air. There are also cake remnants, so there is nothing wrong." Bai Song looked at the photo carefully: "Excluding all impossibilities, there is only one possibility, the balloon is in these bottles, in the wine bottles."
"Child murder?" Everyone became a little excited.
"The problem is in the wine bottle? How did this happen?" Liu Shuyuan frowned.
"I have a solution!" Bai Song suddenly thought of something.
"Hurry up and tell us! Don't keep us in suspense!" Four people gathered around.
"I thought of something called butene." Bai Song said, "The explosion limit of this thing is very low, less than 2%. If two bottles of **butene are all evaporated into gas, this situation may be achieved."
"Butene? Where can we get this stuff?" Everyone was a little confused.
"This stuff is in liquefied petroleum gas." Bai Song said, "When I was a kid, my family used liquefied petroleum gas. Sometimes in the winter, there was no gas because the butene and butane in it couldn't be vaporized. The vaporization temperature of butene should be around minus six degrees."
"The temperature is minus six degrees. It will soon vaporize in the bottle. How can we wait until Yao returns?"
"This is the key." Bai Song thought for a while: "It is not difficult to obtain butene. Just buy liquefied gas and then find a way to distill it. You can learn how to do it online. Here, we must not forget one thing, that is, although the boiling point of butene is minus six degrees, it is under one atmosphere of pressure. If the bottle is sealed to a certain extent and the internal pressure is maintained at more than one atmosphere, there will be no problem."
"That makes sense!" Liu Shuyuan's eyes lit up. "The seal doesn't need to be too good. The outdoor temperature is only about ten degrees now. It's enough to make the seal just enough to maintain this pressure. Once Yao returns home and turns on the air conditioning heating function, the temperature will rise, and the seal will break due to the increase in internal air pressure, and then the butene inside will quickly vaporize."
"Yes!" Wang Huadong also felt that this method was feasible: "Because the density of butene gas is low, it will quickly float to the roof and diffuse in the house. If it reaches a certain concentration, it may explode quickly because there are candles in the house."
"Yes!" Sun Jie nodded: "This plan is feasible. But it requires specific calculations."
Wang Liang looked confused, looked at everyone, and nodded solemnly: "There is some truth to that."
…
Seeing that everyone ignored him, Wang Liang felt a little depressed. Then, he suddenly thought of something and said directly: "There is a problem. When the air conditioner is on, the air in the room is always exhausted. How could this happen?"
"What are you thinking?" Sun Jie complained, "The outdoor unit of a household air conditioner is not used for exhaust at all. It is used to exchange the heat of things like Freon in the pipe. The pipe between the air conditioner and the outdoor unit does not exchange air."
"Oh..." Wang Liang pinched his fingers and said nothing.
…
"Let me calculate it." Bai Song used his mobile phone to check the specific physical and chemical properties of butene.
Assuming that one of the daughter or son brought butene, the two bottles together would be one liter, or 630 grams, which would be about one cubic meter when converted into gas.
It can already meet the lower explosion limit of 1.6% for butene!
"I C, the case was solved, and his son and daughter were arrested." Wang Liang was very excited.
"There are still problems," Liu Shuyuan said after getting excited, "This situation is too ideal."
"Yes," Bai Song agreed. "The most critical difficulty lies in obtaining butene. Although it can be fractionated, the main components of liquefied petroleum gas are propylene, propane, butene, and butane. The boiling points of the first two are relatively low and are easy to fractionate. The last two are only a few degrees Celsius apart. Without professional equipment, they are likely to stay together. The lowest explosion limit of butane is as high as 19%. The most critical thing is that because butene is more widely used in industry, there may be more butane in liquefied petroleum gas."
"Ah?" Everyone lost their temper when they heard Bai Song say this.
"So, that's not the case?" Wang Liang started to worry again: "Or, the murderer must have a special professional channel to get this butene."
"If it was Yao's children who committed the murder, it would be difficult to obtain the so-called relatively pure butene." Bai Song said, "However, although it may not be possible, there is still a remedy, which is to make the hydrogen balloon explode, so that the air in a certain area of the room is compressed, so that the butene and butane that do not reach the explosive concentration are burned at once."
"Is it that troublesome?" Wang Huadong was confused: "Then how do we make the hydrogen balloon explode? It's impossible to put the hydrogen balloon on the candle, right?"
"The problem lies with the fruit." Bai Song thought for a moment, "Fruits can burst balloons."
"What does this mean?" Wang Liang was completely confused.
"Yao's daughter Yao Xin bought oranges for Yao, and it can be seen from the final scene that Yao Xin ate some oranges. Oranges, especially fresh oranges, have flavonoids and limonene in their peels, which can react with rubber. When peeling the orange peel, the liquid from the peel splashes onto the balloon, causing it to explode. Once the balloon explodes, it can reach the explosion limit in a small area nearby in an instant, and then be ignited by the candle, followed by the explosion of other balloons, which then triggers a chain reaction, igniting the butylene and butane that fill the room, achieving this effect."
"If what you said is true, we can fill the balloon with butene gas. The density of this thing is lighter than air." Wang Huadong corrected.
"No, the density of air is 1.2kg per cubic meter. Although the density of butene is 0.6, the density of butane is as high as 2.4. Under the premise that the murderer cannot obtain pure butene, the density of the butene-butane mixture is greater than that of air." Bai Song said: "And the hydrogen balloon was bought casually on the street. From the time analysis, the murderer did not have time to fill it with other gases."
After saying that, Bai Song immediately said: "If this reasoning is correct, my daughter is the murderer. Don't worry about anything else. Bring her back tonight."
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