In the middle of the night, everyone received a call from the public security bureau and came to the conference room of the public security bureau.

"I know how the killer kills!" Her eyes were shining, and she looked like a child who had found a treasure.

Cao Zhen sighed and said, "If it's a fire in the water, didn't you say that there is a lack of hot water and oxygen?" ”

Without these two items, the fire couldn't be ignited at all, and as for the calcium carbide, she also rejected it, why did she change her original intention after a while?

She beckoned, "Come here......"

Everyone walked over as they were told, and was woken up in the middle of the night, they were all sleepy, but she was very excited.

"When calcium carbide encounters water, it will indeed cause high temperatures or explosions due to the production of highly flammable alkynes, but the murderer has made a very clever change......

As she spoke, she demonstrated, holding in her hand the pebble cut from the stone at the scene of the crime, picking it up with tweezers and placing it on the alcohol lamp to bake.

This move frightened everyone, calcium carbide cannot be heated with fire, otherwise it will deflage directly

"White!" Jing Sa screamed and rushed up to stop her, afraid that she would hurt herself.

Lin Mo was also frightened, Yan Zhan Ng wondered if she was thinking too much, her brain was a little unclear, and she took off the windbreaker on her body, wanting to cover her head, so as not to burn her face when the fire broke out.

However, nothing happened, and after the calcium carbide was baked, it didn't even have a trace of smoke except for a little whitish.

This is not scientific, calcium carbide combustion generally produces strong black smoke.

Then, she threw it into the beaker, and the stone slowly sank to the bottom of the cup, and a stream of water bubbles swelled, and it turned from a few bubbles to dense bubbles, and then the water suddenly boiled and tumbled, and with a bang, a fire ignited in the cup, like a volcanic eruption, and there was a raging flame at the mouth of the cup, no explosion, no black smoke, just burning in the cup and the mouth of the cup, forming a fireball.

The crowd was amazed, how could there be a flame?

Calcium carbide will heat up when exposed to water, but it will only produce alkyne, not oxygen, so white phosphorus will not burn because of the water temperature.

The flame in the cup burned hot, but it did not spread to the surrounding area at all, as if there was some limit, and the size of the flame remained the same size as the cup.

She turned her head with a bright smile on her face, "Do you think it's amazing?" ”

It's magical, it's magical.

"How did you do that?" Lin Mo looked at the fire and became excited.

The answer was announced, "Sodium peroxide!" ”

Everyone knows this term for chemistry because it is something that will be taught in junior high school chemistry class.

The greatest use of sodium peroxide is to decompose carbon dioxide into oxygen, which is commonly used as an oxygen supply in submarines, because sodium peroxide can absorb the carbon dioxide exhaled by the human body, produce sodium carbonate and release oxygen for the normal breathing of divers.

This is a very rudimentary knowledge of chemistry.

Jing Sa asked, "What does this have to do with you burning calcium carbide?" ”

Lin Mo's eyes lit up, "That layer of oil!" "When the forensic calcium carbide was tested, some oily substances were found, and it was thought that it was the relationship between this layer of oil.

She smiled and nodded, "That's right! The murderer is very clever and retains the principle that calcium carbide will heat up when it encounters water, but also eliminates the danger of it producing alkyne gas! ”

"He changed the structure of calcium carbide chemical molecules!"

“Exactly！”

Zhang Youcheng asked, "What is that layer of oil?" ”

"In order to avoid the combustion or explosion of calcium carbide when it encounters water, a small amount of purification oil is usually added when calcining calcium carbide to reduce the production of alkyne gas, prevent disasters, and also play an environmental protection role." "In addition, he added a small amount of graphite powder! ”

"Graphite powder?" Cao Zhen felt that his brain was already knotted, and he blamed him for not learning chemistry well when he was a child.

"Once the calcium carbide catches fire, it will be forbidden to extinguish the fire with water or foam, and carbon dioxide is also ineffective, so it must be extinguished with dry graphite powder or other dry powder (such as dry sand)!"

The confusion of the crowd intensified.

"Isn't it contradictory to put out a fire for a while and make a fire for a while?" Jing Sa asked.

"No, it's not a contradiction at all, but this is the most wonderful thing about the murderer."

The crowd stopped interjecting and listened to the explanation.

"When the murderer killed, he only brought a piece of calcium carbide, according to the volume of water, the size of the stone is about the volume of two red bricks, and the size of the stone found at the scene of the crime is about the same, the outer layer is wrapped with a purification oil with graphite powder, before the killing, he will first make the deceased unconscious, and then put the deceased into a container filled with water, and then burn the calcium carbide, because the purification oil is added with graphite powder, to eliminate the danger of calcium carbide combustion, and then after high temperature baking, the chemical molecular structure of calcium carbide has also changed, Become the same as sodium peroxide! ”

Cao Zhen said: "Wait a minute, you said that you want to burn the stone, how to burn it, although it is not large, but if it is burned on the spot, there will always be traces, this is the same as boiling water, since you want to burn, at least you have to set up a bonfire." ”

"It doesn't need to be so troublesome, a butane gas flamethrower, just add a briquette pliers!"

Butane gas flamethrower, not a very tall thing, 40 yuan can buy one, Taobao is sold, mostly used for pastry baking, welding, etc., the size is very small, very easy to carry, the maximum temperature can reach 1300 degrees Celsius, to burn a stone, it may only take three or four minutes.

And briquette pliers are even more ordinary things, also known as fire tongs.

Therefore, there is no need for bonfires, stoves, etc., not even to make a fire, the murderer only needs to clamp the stone with briquette pliers and bake it against the stone with a flamethrower, which is absolutely time-saving and labor-saving.

No wonder there are no other traces of burning at the site,

A stone, a butane gas flamethrower, a briquette pliers, and an ordinary-sized sports backpack can be more than enough to fit, compared to four gallons of water, the size is much smaller, even if you walk in the downtown area, it will not make people feel abrupt, and you really have to admire the murderer's strategy.

"After the calcium carbide is heated, the murderer throws it into the water, it will have a chemical reaction with the carbon dioxide in the water temperature to generate oxygen, once there is oxygen, the white phosphorus in the water will reach the ignition point because of the water temperature, and the fire will instantly ignite, and the dead will be burned to death, and in the combustion process, the purifying oil and toner will be slowly consumed, and when the effect of calcium carbide heating begins to slowly decrease, they will be consumed, which is why when the water is tested, the toner and purifying oil can not be found, it sounds very complicated, In fact, it is a chemical equation that is one ring after another! She paused and took a sip of water, "To put it simply, the murderer retains the characteristics of calcium carbide, removes its shortcomings, and creates his ideal murder weapon, if you are interested, I can show you this chemical equation, the program is very complicated, and it will take a day and a night to talk about it in detail." ”

Everyone immediately shook their heads, dizzy when they heard it, and they were afraid that they would not understand it when they saw it.

Lin Mo said, "No matter how complicated it is, haven't you thought of it too?" "He really admired her.

She shook her head, "My chemistry is not very good, but I have the help of a master!" ”

Her IQ is high, but it doesn't mean that she can do everything.

"Superior? Do you know any chemistry expert! ”

Jing Sa was excited, "I know, it's Ah Hui!" ”

Ah Hui is An Hui!

"That's right, it's this lazy foodie!"

When she was meditating on the relationship between oil and stone, Kangxi's call gave her inspiration, combined with the composition report of the oily substance attached to the stone, she was sure that the murderer must have done something to calcium carbide, he was a person who was very good at chemistry, so to deal with him, she must find someone who was also good at chemistry, so she thought of An Hui.

When she proposed that if the calcium carbide was burned first, and then the water would boil, just like the rolling stone waist flower that Kangxi said, whether it could be safe and correct, An Hui said a lot, and then gave her a super complex chemical equation.

The long-troubled method of 'making fire in the water' killing was suddenly solved.

Except for Jing Sa and Wan Ying, no one else knows An Hui, but it doesn't matter whether they know it or not, the important thing is that people help find the right way for the murderer to kill people.

Jing Sa said proudly: "Ah Hui is my best friend with Wanxi, if you have the opportunity, I will introduce you to you, although she looks a little big and brainless, but she is a little genius in chemistry, when we were studying in the United States, she was the leader of the chemistry group, but it's a pity that ......" Jing Sa waved her hand regretfully, "She is a typical personality who does not seek progress, and just wants to eat and wait for death." ”

Therefore, the saying that people should not be disguised is really an absolute wise saying.

No matter who they are, they will have their own shining points, some people have carried it forward, some people have lost their pearls, some are opportunities, some are not wanted, and the concept of life is different.

She and Yingying have told An Hui more than once that she is not suitable for the entertainment industry, and being a teacher is the most suitable for her, even if she is a kindergarten teacher, just the little chemical magic she is good at is enough to make children take her seriously.

It's a pity that she just wants to be a movie queen, and then she marries into a wealthy family with a beautiful scenery, vanity is certain, but in the end, she is lazy, she wants to be a princess when she is a child, and she wants to be a queen when she is older.

"Chemists can also be beautiful, and they can also marry into a wealthy family!" This is what Jing Sa once said to An Hui.

An Hui replied with a small mouth stuffed with potato chips: "Fuck off, once a woman gets a postdoctorate, this society will demonize her, as if she is not a human being, I don't want it, have you ever seen a wealthy president marry a scientist as his wife?" Not at all! Also, How did Marie Curie die? She died of leukemia due to exposure to radioactive materials, do you know how emaciated she was when she died? ”

"He's a physicist!"

"Isn't a chemist dangerous? Is it good that accidentally touching sulfuric acid will be disfigured! ”

“……”

Every time I talk to her about this issue, she will pull a lot of reasons, what chemistry is very dangerous, what is very harmful to staying up late, and the Nobel Prize is not for everyone, and what if it affects fertility?

And so on and so forth......

She just wants to live a beautiful life, there is food and drink, and there are unlimited black and gold card swipes, as soon as all the new luxury products of the season come out, someone will automatically send them to the house, and if she has nothing to do, she can do a beauty SPA, and she can go to California at any time if she wants to bask in the sun, and it is best to have a luxury yacht named after her, and by the way, she will be starry again.

This is what she calls a good life.

There is no way, everyone has their own ambitions, so they can only let her go.

Everyone has their own life they want to live, and as long as she doesn't want to, no one can force her.

"That's right!" Wanwan looked at Lin Mo and Cao Zhen, "She didn't help for free......

Originally, An Hui didn't want money, but seeing that she was helping the police solve the case, she really helped again, and there was no reason to do day work, besides, she didn't have much income recently, and her credit card was maxed out again, so she asked for compensation.

She compared a number, "Fifty thousand!" ”

“……”

Got it, they'll report it.

Now that the murder method has been cracked, only the question of who is the murderer remains, and she glanced at her mobile phone, just waiting for the results of Ji Xiaonan's investigation. Five days later......

Ji Xiaonan transmitted the first batch of information found to her.

------Off topic------

After the wee hours of the morning, maybe, maybe, there was another shift, and I got stuck in the second half...... Hands tremble, hands tremble!