"Even if the room is sealed again, there is a leak, and if some kind of flammable gas was introduced a few days ago, it will be astigmatized anyway. Bai Song said: "Yao's personal situation must rule out suicide, and there is no such thing as a gas canister in his house, so if you want to have enough B explosives, you must have enough flammable gases or particles." ”

"If you say pellets, this room is just accommodation, no flour or anything like that. Wang Huadong said.

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

The volume of the room is more than 30 cubic meters, and even if it does not require 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 it be that there is no hydrogen in the balloon?" Wang Liang asked, "Will the other gases have a lower limit of B explosion?"

"Impossible. Wang Huadong shook his head: "There are so many gases that can float up with balloons, and it is impossible to do so." ”

"That means there are other gases. After Bai Song finished speaking, he continued: "Or granules." ”

"Could it be that the cake is full of flour?" Wang Liang thought on a whim again.

"You can't even light a packet of flour at home, the flour has to be evenly distributed enough in the air, and the cake has wreckage, so there's no problem. Bai Song looked at the photo carefully: "Eliminate all the impossibilities, there is only one possibility, the balloon is in these bottles, in the wine bottle." ”

"Is the child murdered?" everyone was a little excited.

"The problem is in the wine bottle, how can this happen?" Liu Shuyuan frowned.

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

"Tell me, don't sell it!" all four people gathered around.

"I came up with something called butylene. Bai Song said: "The frying limit of this thing B is very low, within two percent, if it is two bottles of liquid butylene, all volatilized into gas, it is possible to achieve this situation." ”

"Butene, where can I get this thing?" everyone was puzzled.

"There's this stuff in LPG. Bai Song said: "After an hour, liquefied petroleum gas is used at home, and sometimes there is no gas in winter, because the butene and butane in it cannot be gasified." The vaporization temperature of butene should be about minus six degrees. ”

"Then minus six degrees, it vaporized soon after it was in the bottle, how could you wait until Yao went back?"

"That's the key. Bai Song thought for a while: "It's not difficult to get butylene, just buy liquefied gas, and then find a way to fractionate it, you can learn how to do it on the Internet." In this, we can't forget a problem, that is, although the boiling point of butylene is minus six degrees, but it is an atmospheric pressure, if the bottle is sealed to a certain extent, and there is more than one atmosphere pressure inside, there will be no problem. ”

"That makes sense!" Liu Shuyuan's eyes lit up: "This seal doesn't need to be too good, now the outdoor temperature is only about ten degrees, and the seal can just be made to maintain this pressure." Once Yao goes home and turns on the heating function of the air conditioner, the temperature rises, and the seal will be broken due to the increase in internal air pressure, and then the butene inside will quickly vaporize. ”

"That's right!" Wang Huadong also felt that this method was feasible: "And because of the low density of butylene gas, it will quickly float to the roof and permeate the house, if it reaches a certain concentration, it may quickly B explode, because there are candles in the house." ”

"Hmm!" Sun Jie nodded: "This plan is feasible. However, it needs to be calculated. ”

Wang Liang looked confused, looked at everyone, and nodded pretending to be deep: "There is a certain truth." "Love Literature Network

...

Seeing that everyone ignored him, Wang Liang was a little depressed, and then, he suddenly thought of something, and said directly: "There is a problem, when the air conditioner is on, the air in the house is not exhausted all the time?

"What do you want?" Sun Jie complained: "The outdoor unit of the household air conditioner is not used for exhaust at all, it is used to exchange the heat of something like freon in the tube." The tube between the air conditioner and the outdoor unit is non-ventilating. ”

"Oh..." Wang Liang pinched his fingers and did not speak.

...

"I'll do the math. Bai Song took his mobile phone to check the specific physical and chemical properties of chabutene.

Suppose a daughter or son has a person who carries butene, then the two bottles add up to one liter, a total of 630 grams, and when they become gaseous, they are about 1 cubic meter.

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

"I, C, solved the case and arrested 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 agreed: "The most critical difficulty lies in the acquisition of butene, although it can be fractionated, but the main components of liquefied petroleum gas are propylene, propane, butylene, butane, the first two boiling points are relatively low, easy to fractionate, the last two are a few degrees Celsius, no professional equipment is likely to stay together." The lowest limit of butane is as high as 19%, and the most important thing is that because butene is more widely used in industry, there may be more butane in LPG. ”

"Huh?" everyone was deflated when they heard Bai Song say this.

"So, isn't this the case?" Wang Liang suffered again: "Otherwise, the murderer has a special professional channel to get this butylene." ”

"If Yao's children murdered, it is estimated that it will be difficult to get the so-called purer butene. Bai Song said: "However, although it may not be achieved, there is still a remedy, that is, to let the hydrogen balloon deflagrate, so that the air in a certain area of the room is squeezed, so that the butene and butane that cannot reach the B explosion concentration can be burned at one time." ”

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

"The problem is the fruit. Bai Song thought for a moment, "Fruit can burst balloons." ”

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

Yao's daughter Yao Xin bought oranges for Yao, and it can be seen at the final scene that Yao Xin ate a little orange. Tangerine, especially fresh tangerine, has flavonoids and limonene in the peel of oranges, 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 a balloon bursts, it can reach a small explosion limit in the vicinity for a split second, then be lit by a candle, then all the other balloons burst, and then set off a chain reaction that ignites the butylene and butane that fill the room. ”

"If you do what you say, you can fill a balloon with butylene gas, and it's lighter than air. Wang Huadong pointed to the right path.

"No, the density of air is 1.2kg per cubic meter, although butene is 0.6, but butane is as high as 2.4, under the premise that the murderer cannot obtain pure butene, the density of the butene and butane mixture obtained is greater than that of air. Bai Song said: "And the hydrogen balloon was bought casually on the road, and from the time analysis, the murderer didn't have time to fill other gases." ”

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