"So what's the use of this thing, and that physics?" Tuohuan asked.

"It's very useful." Guo Kang pointed to the tube: "This thing proves that the air around us exists, and it has the same pressure as water." Just as fish live at the bottom of the ocean of water, we live at the bottom of the ocean of air. ”

"I see." Dmitry was intrigued: "Is heaven just above this sea of air?" ”

"I don't know." Guo Kang did not answer directly: "After all, Aristotle was a pagan philosopher before Brother Tian, and his knowledge of Heavenly Father, Heavenly Brother, and Heaven is limited. While this does not hinder his great contributions in the field of philosophy, we should not force people of different eras. What he hasn't covered yet, we have to study. ”

"That's true." The monks agreed.

"That's so much pressure, why can people still be round? Anyone else getting fat? Tuhuan asked suspiciously: "For example, look at my sister." Why wasn't she crushed...... Uh, it's as flat as Li Anning? ”

"People are not sealed, how can you compare." Guo Kang retorted: "Look at this glass tube, is the top empty?" It is surrounded by mercury and glass tubes, so the air pressure can be seen. ”

"What does it have to do with air pressure?" He said helplessly: "I'm flat, but I still complain about the air......"

"Ah......h

"In short, this device is equivalent to pitting the pressure of mercury against the pressure of air." Guo Kang also ignored him and continued to explain: "The mercury finally stopped, indicating that the forces on both sides are equally great. This is because mercury is very heavy, so it can be seen directly in this way. And if you change to lighter water, you can't observe it so easily. ”

"And this device is also valuable to us." He said to the monks, "Bring that elbow pipe." ”

One assistant left to pick up the equipment, while the others followed Guo Kang's request and placed the tube at a different angle for everyone to see.

"The pressure of the air can only support such a high level of mercury, so no matter what shape or height the glass tube is, there will only be so much." "And above the mercury in the pipe, in the space that was pulled out after the fall, there was hardly any air and no liquid," he said. I call this kind of area 'vacuum'. ”

The monks were accustomed to him casually saying Chinese words, but they didn't care about it as a term. Dehuan is impressed.

"I seem to have heard Master Wang's introduction. Isn't that the word of the White Lotus Sect? He pointed out: "These people seem to have a close relationship with the Red Turban Army at the end of the Yuan Dynasty, so we have also learned about it." ”

"Well, that's right......" Guo Kang scratched his head: "Anyway, as long as I can express the meaning, I feel quite appropriate." ”

"Of course, if the White Lotus Sect is interested, then we can also support it." He adds: "The early development of natural philosophy did require theology to a large extent. ”

"Maybe they can also enrich their theological research, calculate how many lifeless mothers can live in the vacuum hometown in the mercury pipe, and promote the development of scientific research in the Ming Dynasty......"

"Ah......" Tuhuan was dumbfounded again and couldn't answer.

While a few people were talking, the assistant had already brought another pipe. The glass tube was thinner than the one before, but above the long tube, there was a bulging round bubble that looked like a strange hammer.

At each end of the round bubble, a copper rod was inserted, which should have been made with holes and then fixed with melted glass.

"This looks like the device in Brother Tian's hand." Dmitry keenly spotted the similarities: "Just why was it made in this shape? ”

"Because of this tool, you need to keep a vacuum." Guo Kang pointed to the glass bubble.

A few assistants cleaned the previous glass tube, filled it with mercury, and then erected it as well. The tube was long, and the mercury fell as before, and finally stopped in mid-air.

"Look, this glass bubble on top of this is a vacuum." Guo Kang said: "We use ice cubes to cool it, and at the same time use hot iron tongs to shape the glass, plug and cut the thin tube below, so that we can get a relatively stable vacuum glass bubble with electrodes." ”

"So what's the use of it?" Twisted off the joy and persevered: "I look at this thing, I guess it's not cheap." ”

"What's the use of it? If it succeeds, it's a miracle of physics. Guo Kang didn't bother to pay attention to him: "Even if we make a half-baked product now, it will be very useful." ”

"Show him our hand-pulled light bulb." He commanded.

The other monk then ran again and brought a hollow glass cylinder. It also has electrodes inserted at both ends, and an additional connector in the middle, which is held in place by a valve and a leather strip.

"I made a pumpback out of copper, leather, and lubricating wax to pump this thing." He said: "It's not clean, but it's enough." In this glass tube, there is a little bit of mercury. When you use it, heat it up first, and then electrify it, and it will emit a special light. ”

"This kind of light, which the human eye can't see clearly, is very powerful. Do you remember the little bug I told Wu Han about? It can kill all the bugs. Guo Kang said: "Let's find a room, put this thing inside, and then someone will supply it with electricity from the outside, and it will have an effect." ”

"The Slavs can't push it all day and all night, but a light bulb isn't too hard to do, just find a water-powered mill."

"If we can kill these insects, will there be hope for our military rations?" Tuhuan is still thinking about this problem.

"This needs to be tested, but other uses are already worth looking forward to." "The vacuum tube hasn't been tested yet, but I've worked with a nearby village to try this mercury lamp," Guo said. ”

"Huh? You didn't tell me. Tuhuan wondered.

"It was your sister who told me that I remembered." Guo Kang said: "The last time she talked to me about the noble women around her about giving birth, I told her about the cause of puerperal fever. ”

"I thought that we could set up a special delivery room and use this mercury lamp in advance to kill poisonous insects in the environment. Combined with our highly concentrated spirits processed with lime, the environment is much cleaner. ”

"She doesn't say, I can't think of this yet." Guo Kang spread his hands: "So, I found a village with pregnant women and renovated their mill. When you need to use it, you can change the two gears to direct the power to a purpose-built room next to the mill. ”

"The priest in their village has also memorized the prayers and mantras, and will probably use them. I tried to let them do it, and it wasn't very stable, but it did stay on. The whole room was filled with blue-purple light. ”

"Pregnant women from their village, as well as from several neighboring villages, are giving birth there. The results were good, and there really were no problems. The villagers were moved and felt that this purple house must have divinity, but unfortunately the lights were turned off when people entered, otherwise everyone would have been born in the purple tent. ”

"The priest from there also came here every day, saying that in the future, he wanted the children of the village to come to us for theological enlightenment. Some time ago, Dean John asked if he wanted to build a school altogether, and that's how he remembered. ”

"No wonder, this is the miracle of physics." Brother Dmitry also sighed.

(End of chapter)