Chapter 25 Physics Class and Exploration on the Principles of Refrigerators

The content of mathematics courses is not profound, especially at this stage, it is still within the scope of "cognition", such as the understanding of numbers, understanding of simple geometric figures, etc.

In addition, they were taught addition and subtraction within 20 by combining the addition and subtraction of fingers.

The physics classes that followed were relatively complicated.

Unlike several other courses, 'Physics' is only the first class, and is temporarily taught by Benya himself.

——

"I heard he's the Blade Tooth Witch Doctor, the youngest one."

"The one who created the word?"

"Yes, and the 'mathematics' we learned before seems to have been developed by him."

"Ah! He is the sinner who destroyed our childhood."

"Come on, if it weren't for the Blade Tooth Witch Doctor, you wouldn't even know what 'destruction' and 'childhood' are."

"Haha, that's what I said."

The little ones who entered the classroom again were waiting amidst the noise caused by the exchanges between each other.

"Well, I have similar thoughts, but as I told you before, our observation methods for the 'microscopic world' are too limited, so we can only classify it as 'guessing' for the time being."

"First, we have to study the meaning of each word."

'First of all, the refrigerator does not have an external liquid inlet, which means that the liquid inside it should be called 'refrigerant', right?'

"Okay."

"So, can we know where I was in the second second? If I continue walking, where will I be in 30 seconds?"

‘First assume that the heat of the radiator has nothing to do with the temperature brought out of the refrigeration zone. Based on this premise, it is logical to see where the low-pressure steam flowing out should go.’

After class, Blade Ya met the old witch doctor who had been listening in the corner and asked.

He walked around the podium, stood in front of the little trolls, and said,

‘Let’s first sort out the working principle of the refrigerator in the previous life. There was no electricity, no metal mines, and no processing methods. Although it may not be of much use to sort it out. I hope it can at least expand my thinking.’

"Okay, then we can select a group of good students and train them first."

'But how to do evaporation at low temperatures?'

"In other words, I walked 20 meters in five seconds."

‘The internal heat is transferred to the fence through some means and dissipated. Isn’t that right?’

"'How does matter evolve?' This question seems a bit big, but it is a good starting point."

'It means that the refrigerant inside it is recycled. In other words, the low-temperature and low-pressure liquid flowing into the refrigeration area and the low-pressure gas flowing out of it are from the same source.'

"And 'the change of x at different moments' can be extended to 'movement'. In other words, this question is asking 'How does movement happen?', 'What is its basis?'" How to know it?

Where to go next?'."

After all, Banya is not a teacher, so the difficulty and accuracy of the content still make it difficult for him.

"You must all know the words 'wu' and 'li'. After all, I greeted your literacy teacher."

"Let's look at 'evolution' again. We often say 'how was it yesterday', 'how was it today', and 'what was the day after tomorrow'? This is a kind of evolution, which talks about a relationship that changes over time. In essence, this

It is a kind of time dependence. We will record it as 'f(t)', which is used to express the dependence between the change quantity f and time t. Well, this is a 'function' that you will only come into contact with in the future; now?

, you just need to know that this is the case..."

"There's no way. After all, the age span is so big that it's normal to have differences in understanding. However, we don't expect them all to understand. Anyway, our boat is small and easy to turn around. Let's follow this rhythm for a while and then organize it again later.

'Examination', depending on the situation, we will decide whether to stream it or simply lower the difficulty level."

'To remove or dissipate heat by allowing it to evaporate in the refrigerated area?'

"Now, I'm here"

'Heat dissipation? If it's the human body, part of the heat dissipation should be through evaporation of sweat.'

"Okay, you can take control of it, but you can't relax in your research. Come to us three old guys anytime if you need it."

After saying that, he slowly walked to the middle of the 'classroom' and said again,

"At this moment, I stood here again. There was about 20 meters in between. During this period, I counted silently in my mind for about 5 seconds."

He took the huge clay tablet he had prepared from the side and placed it on a wooden support.

'In other words, the liquid flowing into the refrigeration area may be low-temperature and low-pressure liquid.'

This time, he planned to come up with something that had been subconsciously denied earlier due to lack of energy, metal and other conditions.

At this moment, I can only try my best to repeat the knowledge in my mind in a way that I think is easy to understand.

"Okay, I plan to formally teach them about 'uniform linear motion' in the next lesson."

After a brief exchange, the two trolls left.

"How do I know? Why can I calculate the position 3 seconds ago and even the future position 30 seconds later if I know the starting point, time spent, and distance traveled?"

Due to various previous 'simple' storage methods, development has failed.

‘Is it called hot exchange? Or is there another name?’

"So in this first class, let's just talk about what exactly 'physics' is."

With this in mind, he began to try to recall the structure of the refrigerator at home when he was a child.

"Well, it's good to be cautious. However, I think the children don't understand much. Is the content too in-depth?"

"Going back to the question of 'how does matter evolve'? In fact, the thought we just made is one of the expressions of 'how'. It is asking how did x(t) come from, and how does x

Where should the moment change?"

On the clay tablet, the words "How matter evolves" were engraved in large words. In order for all the trolls to see clearly, the words were carefully daubed with charcoal.

“Let’s go back to the problem itself, that is to say, ‘material evolution’ can be expressed as ‘x(t)’.”

In short, it is hard to say how effective the class was. Anyway, some of the little ones were blank-eyed and didn't seem to understand anything, while others were thoughtful.

'The place where vapor compression is carried out is called the compression area.'

"Then what flows out of the refrigeration area is low-pressure steam? What about the temperature? The refrigeration area is not a furnace. It takes away heat or consumes heat. Intuitively, you don't think the temperature will rise too much at this time?'

'Let me think about it, is there any principle? On the plateau, the boiling point of water will be lower. It seems that the key lies in low pressure?'

'Well, it doesn't matter what the name is, let's think about the means of transferring heat first.'

'So, what the radiator dissipates is actually the heat released when the refrigerant vapor is compressed into a liquid state? Well, this makes more sense.'

‘There is such a phenomenon when liquid evaporates and absorbs heat, right? Therefore, it does not necessarily take away heat. Maybe the conversion process itself consumes heat. For the time being, we just need to know this result.’

"Old witch doctor, what do you think?"

‘It seems that the back of the old-fashioned refrigerator has a metal fence that emits heat. Combined with the low-temperature environment inside the refrigerator, if you think about it together, it seems that you can easily summarize the working principle.’

"Next, let's see what 'how' is."

‘It can be deduced that the liquid flowing into the refrigeration area should be low-temperature liquid to facilitate the removal of heat’

"I'm very inspired, especially by 'Mastering the arrangement of elements in space'. I feel like our current use of magic can also be explained by this?"

It didn't take long for Banya to arrive. He placed the 'teaching aids' made of large and small clay tablets in his hands beside the podium, and went directly into the class without saying anything else.

‘To sort it out, compression zone - high temperature and high pressure liquid - heat dissipation zone - low temperature and low pressure liquid - refrigeration zone - low temperature and low pressure gas - compression zone. And so on.'

...

"What is 'matter'? Let's first make the assumption that all matter is composed of smaller 'elements'. Then if we master the arrangement of each 'element' in space, is it equivalent to

Have you mastered this matter? Therefore, matter can be extended to the position of an 'element' in space, and here we first use 'x' to represent it."

"Well, actually, we can know that as long as my traveling speed remains 'constant', I can walk 8 meters in the second second, and I can walk 120 meters in the 30th second."

Returning to the 'laboratory', Blade Ya started research again.

'Then where does the heat that the radiator dissipates come from?'

'Let me think about it, gas changes to liquid. Pressurize? Compress steam? If so. If the liquid changes to gas, it will absorb heat. If the gas changes to liquid, will it reverse and release heat? Low-temperature and low-pressure steam will be compressed and become

into a high temperature and high pressure liquid.'

Having said that, Banya bent down, took a square clay tablet with an 'x' engraved on it, twisted the thread with the wood fiber tied to it, and hung it on the short vertical pole reserved on the bracket.

'Switching to a refrigerator, the cooling area absorbs heat, and the heat dissipation area evaporates the heat of the human body. So the evaporation step should occur in the cooling area, not the heat dissipation area that is subconsciously associated with it.'

‘Then this process must go through one or several processes before it can be used again’

'No, the span from high-temperature and high-pressure liquid to low-temperature and low-pressure liquid is too large. The heat dissipation area should not have this ability. Therefore, there should be a step in the middle.'

‘This step should play a role in cooling down and reducing pressure’

'When the pressure drops, the boiling point of the liquid decreases. When the boiling point decreases, it is easy to evaporate. Evaporation consumes heat, which naturally lowers the temperature. So, low air pressure = easy evaporation = lowering the temperature. Should we just consider how to reduce the pressure?'

‘Break down the pressure.’
Chapter completed!