Police Detective

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"Even if the room is resealed, it is still leaking. If a certain flammable gas was introduced a few days ago, it would have been astigmatized anyway." Bai Song said, "Yao's personal situation is definitely to exclude suicide. For this kind of thing, there is no such thing as a gas tank in his house, so if you want to have enough B explosives, you must have enough flammable gas or particles."

"If you talk about pellets, this room is just for lodging, and there is no such thing as flour." Wang Huadong said.

"Yeah," Bai Song took out his pen and began to analyze on the paper.

The room has a full volume of more than 30 cubic meters. Even if there is no need for gas to fill every part of the room, the amount of flammable gas required is at least five times that of the hydrogen balloons.

"Could there be no hydrogen in the balloon?" Wang Liang asked, "Will other gases have a lower explosive limit?"

"Impossible." Wang Huadong shook his head: "There is so much gas that can float with a balloon, and it is impossible."

"That means there are other gases." Bai Song finished, and then said: "Or particles."

"Will there be flour in the cake then?" Wang Liang once again had a whim.

"If you take a bag of flour at home, you can't even light it. This flour must be evenly distributed in the air, and the cake also has debris. There is no problem." Bai Song carefully looked at the photo: "It's impossible to get rid of everything. , There is only one possibility, the balloons are in these bottles, in the wine bottles."

"Are children murdered?" Everyone was a little excited.

"The problem is the wine bottle? How to do this?" Liu Shuyuan frowned.

"I have a way!" Bai Song suddenly thought of something.

"Say, don't sell it!" All four people gathered around.

"I thought of something called butene." Bai Song said: "The explosive limit of this thing B is very low, within 2%. If it is two bottles of liquid butene, all volatilized into gas, it may reach in this situation."

"Butene? Where can I get this stuff?" Everyone was puzzled.

"Liquefied petroleum gas has this thing." Bai Song said: "Liquefied petroleum gas is used at home after hours. In winter, sometimes the gas cannot be produced because the butene and butane in it cannot be vaporized. Butene gas The melting temperature should be around minus six degrees."

"Then it's six degrees below zero, and soon I vaporized in the bottle? How can I wait for Yao to go back?"

"This is the key point." Bai Song thought for a while: "It is not difficult to obtain butene. Buy liquefied petroleum gas and find a way to fractionate it. You can learn how to use this stuff online. There is one problem we can't forget about Ding. Although the boiling point of alkene is six degrees below zero, but when it is at an atmospheric pressure, if the bottle is sealed to a certain extent and the internal pressure is maintained at more than one atmospheric pressure, there will be no problem."

"It makes sense!" Liu Shuyuan's eyes lit up: "This seal does not need to be done very well. Now the outdoor temperature is only about ten degrees, and the seal can be made to maintain this pressure just now. Once Yao returns home, turn on the air-conditioning system. With thermal function, the temperature rises, the seal will be broken due to the increase in internal air pressure, and the butene inside will quickly vaporize."

"Yes!" Wang Huadong also felt that this method was feasible: "Because of the low density of butene gas, it will quickly rise 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. exist."

"Yeah!" Sun Jie nodded, "This plan is feasible. But it needs specific calculations."

Wang Liang looked dumbfounded, looked at everyone, and nodded pretentiously, "There is a certain truth."

...

Seeing everyone ignore themselves, Wang Liang was a little depressed. Then, he suddenly thought of something and said directly: "There is a problem, the air conditioner is turned on, and the air in the house is not being exhausted all the time? How could this happen?"

"What do you want?" Sun Jie vomited: "The outdoor unit of the household air conditioner is not for exhaust at all. It is used to exchange the heat of things similar to freon in the pipe. Air conditioner and outdoor unit The pipe in between is not ventilated."

"Oh..." Wang Liang pinched his fingers and said nothing.

...

"Let me do the math." Bai Song checked the specific physical and chemical properties of chabutene with his mobile phone.

Assuming that a daughter or son is carrying butene, the two bottles add up to one liter, a total of 630 grams, which is about 1 cubic meter after becoming gaseous.

It can already meet the 1.6% lower limit of B explosion for butene!

"IC, solved the case and arrested both his son and daughter." Wang Liang was very excited.

"There are still problems," Liu Shuyuan said after being excited, "This state is too ideal."

"Yes", Bai Song expressed his approval: "The most critical difficulty lies in the acquisition of butene. Although it can be fractionated, the main components of liquefied petroleum gas are propylene, propane, butene and butane. The first two have relatively low boiling points. , It is easy to fractionate, the latter two are just a few degrees Celsius away, and they are likely to stay together without professional equipment. The B explosion limit of butane is as high as 19%. The most important thing is because butene is used in industry. More broadly, there may be more butane in the liquefied petroleum gas."

"Huh?" Everyone was discouraged when Bai Song said this.

"So, isn't this the case?" Wang Liang became concerned again: "Or, the murderer has a special professional channel to get this butene."

"If Yao's child is murdered, it is estimated that it will be difficult to get the so-called pure butene." Bai Song said: "However, although it may not be achieved, there is still a remedy, which is to let the hydrogen balloon deflagrate. This causes the air in a certain area of ​​the room to be squeezed, so that butene and butane that do not reach the B explosive concentration are B-burned at one time."

"Is it so troublesome?" Wang Huadong was dumbfounded: "Then how to make the hydrogen balloon deflagrate? It is impossible to put the hydrogen balloon on the candle, right?"

"The problem is with the fruit." Bai Song thought for a while, "Fruit can burst the balloon."

"What does this mean?" Wang Liang couldn't understand it at all.

"Yao's daughter Yao Xin bought oranges for Yao, and it can be seen from the last scene~www.novelmtl.com~ Yao Xin ate some oranges. Oranges, especially fresh oranges, orange peels There are flavonoids and limonene in it, which can react with rubber. When the orange peel is peeled, the liquid from the orange peel splashes on the balloon, and the balloon is burst. Once the balloon bursts, it can reach a small explosion limit nearby in an instant. It is then lit by a candle, and then the other balloons burst open, and then a chain reaction is triggered to ignite the butene and butane in the room to achieve this effect."

"If you follow what you said, you can fill the balloon with butene gas. The density of this stuff is also lighter than air." Wang Huadong pointed out.

"No, the density of air is 1.2kg per cubic meter. Although butene is 0.6, butane is as high as 2.4. Under the premise that the killer cannot obtain pure butene, the density of the mixture of butene and butane is higher than that of air. "Bai Song said: "Moreover, the hydrogen balloon is bought casually on the road. From the time of analysis, the murderer has no time to fill other gases."

After finishing speaking, Bai Song said immediately: "If this reasoning is true, the daughter is the murderer, don't care about everything else, bring her back tonight."

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