Chapter 1825

"Squeeze the silk first, and then buckle it on the jar. Remember to seal it tightly when you take it later."

Zhang Fengqian exhorted Wan and said seriously. Now it can be said that it is the last and most important step. As long as hydrogen is successfully obtained, it means that the experiment is successful and can be popularized in a large area.

"Yes, teacher."

Ma Zhou nodded. He also heard the indisputable tone in his mentor's tone and didn't dare to slack off: "Chu Jun, come and help."

They pinched one end of the silk edge and began to force each other, trying to squeeze the air out of the silk. Of course, they didn't know what air was, but they just kept doing as their mentor told them.

"Yes."

When Zhang Feng saw that he was almost there, he quickly waved to stop: "now you put the silk on the jar."

The two nodded, gently unfolded the silk and put it on the jar.

"Mentor, it's already set."

Hao Chujun pulled this corner and said seriously.

"OK, next, put your hand in and gently remove the cardboard, and then seal the silk mouth after a cigarette."

Zhang Feng stared at the silk and said seriously, "remember to seal it tightly. It's best to tie it with a rope."

The two nodded, continued their movements, reached out and slowly took off the cardboard. They listened to Zhang Feng's instructions. After almost a cigarette, they slowly took off the silk. At this moment, they quickened their speed, grabbed the air outlet and tied it tightly with a rope.

"Mentor, it has been completed."

Ma Zhou handed the silk to Zhang Feng.

Zhang Feng took it with joy on his face, played with it in his hand, and rubbed it twice from time to time to feel soft. However, soon the smile on his face disappeared and replaced it with a touch of sadness.

The experiment is finished, and the hydrogen is collected, but how can we know that there must be hydrogen in it?

You know, this thing is a colorless, transparent, odorless, tasteless and insoluble gas in water. In this era without various facilities, there is no way to identify it at all.

However, this thing has another big disadvantage, that is, it has high flammability and is very easy to burn, which is one of the reasons why hydrogen is used less.

flammability?

Can you try it with fire?

Anyway, there is not a lot of hydrogen in it. There should be no danger, and this is the only way now. Otherwise, there is really no way to identify whether it is hydrogen or not.

Thinking of this, he tilted his head slightly and looked at Chumo around him, showing a smile.

"Feng Zi, what are you laughing at? Are you having a bad idea?"

Chumo hugged him with both hands, just like a resentful woman, for fear that others would take advantage of him.

"Go, just like you, can you protect yourself so tightly? Don't pee and look in the mirror."

Zhang Feng pouted and smiled: "now there's a good job. Who will do it? There's a reward."

"What reward?"

As soon as they heard of the reward, the three scrambled for fear of falling behind.

"How about a ascension benefit?"

Zhang Feng stretched out a finger and smiled.

"Just once."

Chumo frowned and said, "forget it. Who are they going to?"

Obviously, he was a little shadowed by the experiment just now. Now he doesn't want to go on without good things.

"I'll go."

Du Gou raised his hand and glanced at the crowd: "isn't it an experiment? What's the matter?"

He didn't worry about the danger. Anyway, Fengzi wouldn't hurt himself.

"Well, big cake is the real man. It's not like you."

Zhang Feng came forward and patted Du Gou on the shoulder, showing a satisfied color on his face.

"Feng Zi, what do you need me to do?"

Du Gou asked curiously.

"You go and light this torch and put it at the silk air outlet."

Zhang Feng showed a meaningful smile. With that, he took out a fire fold from his waist and handed it to Du Gou.

Du Gou took over the fire and wondered, "Fengzi, are you going to burn this silk?"

"Of course not."

Zhang Feng smiled and didn't explain much: "just do what I say."

Du Gou nodded. He didn't understand this and didn't want to take care of it. He did his best according to the instructions. He opened the fire fold and stretched out to the silk opening. Zhang Feng opened the opening. At this moment, a glimmer of fire suddenly erupted. Scared Du Gou quickly threw away the fire fold and took two steps back.

Seeing this, Zhang Feng quickly tightened the silk gap for fear of exposing a trace of hydrogen. Then he looked at Du Gou and said with concern: "big cake, how are you?"

What people say is that they have sacrificed for the experiment. They should be concerned.

But the guy seemed to be frightened and couldn't speak when pointing to the silk.

"Feng Zi, this..."

Du Gou pointed to the silk and looked a little ugly.

"It's all right. Don't panic."

Zhang Feng comforted at will, and a trace of satisfaction appeared on his face.