Chapter 511

In the middle of the night, when they received a phone call from Hu, they all came to the meeting room of the Public Security Bureau. When they arrived, she was playing with the previous experiment of "making a fire in water" on the meeting table. They were a little confused and looked at her together.

"I know how the murderer killed people!" Her eyes were bright and she looked like a child who had found treasure.

Cao Zhen gasped and said, "if it's a fire in water, don't you say it's short of hot water and oxygen?"

The hot water lacks the conditions to burn, and the oxygen is because there is no oxygen in the water. Without these two items, the fire can't start at all. As for the calcium carbide, she also rejected it. How can she change her original intention after a while?

She waved, "come here..."

They walked by and woke up in the middle of the night. They were all sleepy, but she was very excited.

"When calcium carbide meets with water, it will produce alkyne gas which is very easy to burn, causing high temperature or explosion, but the killer has made a very clever change..."

She said while demonstrating, holding the small stone cut from the stone at the scene of the crime, picked it up with tweezers and baked it on the alcohol lamp.

This action startled people. Calcium carbide can't be heated by fire, otherwise it will explode directly.

"Ho ho!" Jing SA screams and rushes up to stop her for fear that she will hurt herself.

Lin Mo was also frightened. He seriously doubted whether she was thinking too much, and her brain was a little confused. He took off her windbreaker and tried to cover her head, so as not to burn her face when the fire started.

However, nothing happened. After baking, the calcium carbide didn't even smoke except a little white.

This is unscientific, calcium carbide combustion will generally produce strong black smoke.

Then, he dropped it into the beaker, and the stone slowly sank into the bottom of the beaker, and a stream of bubbles rose. From several bubbles to dense bubbles, the water suddenly boiling and rolling, whew, a fire broke out in the beaker, just like a volcanic eruption. There was no explosion or black smoke, just burning in the beaker and the mouth of the beaker, Formed a fireball.

People were surprised, how could the fire start?

Calcium carbide will heat when it meets with water, but it will only produce acetylene gas, not oxygen, so white phosphorus will not burn because of water temperature.

The flame in the cup is blazing, but it won't spread to the surrounding at all. It seems that some restrictions have been set, and the size of the flame is always the same as that of the cup.

He turned back, smiling brightly, "do you think it's amazing?"

It's more than magic. It's like magic.

"How did you do it?" Lin Mo looked at the fire and got excited.

He announced the answer, "sodium peroxide!"

This chemical title is known to all, because it is something that junior high school chemistry class will teach.

The greatest magical function of sodium peroxide is to decompose carbon dioxide into oxygen. Sodium peroxide is often used as an oxygen supply agent in submarines, because sodium peroxide can absorb carbon dioxide exhaled by human body, generate sodium carbonate and release oxygen for normal breathing of divers.

This is a very elementary knowledge of chemistry.

Jingsa asked, "what does it have to do with your calcium carbide burning?"

Limmer's eyes lit up, "that layer of oil!" During the test of calcium carbide, we found some oily substances, which is the relationship between this layer of oil.

He nodded with a smile, "that's right! The killer is very clever. He keeps the principle that calcium carbide will generate heat when it meets with water, but he also eliminates the danger of acetylene gas produced by it! "