But before Wu Bin could answer, Academician Chen Xianhui said directly: "This means that what you get is only a diagram drawn with computer software, and the specific relationship between it and physics needs to be pondered carefully." ”

"Don't take the output of the instrument as physics, if you do this to experiment with physics, you will be in trouble in the future."

After listening to this, Wu Bin said thoughtfully: "Professor, do you mean to think about things with physical thinking?" ”

"That's right, that's what it means, experiments and machines were originally intended to facilitate our better understanding of the world, but now more and more people are overly relying on the data tested by machines."

"Take temperature, for example, temperature is measured by a thermometer, and the measurement principle of all thermometers is to measure another physical quantity, and then convert it into a value according to a theoretical formula or hypothesis that may or may not be solid, and that value is called temperature."

However, when doing experiments, quite a lot of people only look at the value of the "temperature" column given by their own instruments, but do not understand what the temperature is, and end up suffering a considerable loss. This is how many of the bad physics, when it comes to temperature. ”

"There was once a laughable thing in our Institute of Physics, you should know that crystal growth is a very important direction, it can be said that the most important thing in the study of condensed matter physics is to obtain a substance with a specific physical property, which may no longer be a naturally occurring substance, but needs to be obtained through our efforts."

Wu Bin couldn't help but nod as he listened.

For him, who has been studying materials science for a long time, the number of times he has dealt with crystals can be said to be quite frequent.

Seeing Wu Bin's nod with deep feelings, Chen Jinhui said with a smile: "It seems that you should understand very well that crystal growth is a very difficult and very comprehensive discipline, and one of the key factors in this is temperature control, where do we get the temperature, what is the temperature of the data measured by that instrument, and what false signals this instrument may cause will affect our research." ”

"There used to be some kind of failure in all of our instruments for growing crystals, and the bismuth crystals in it didn't grow well, but after the experimenters checked it, they found that all kinds of conditions were well controlled, and finally tossed a laboratory for half a year to find the reason, guess what?"

"This ......"

Since Academician Chen Xianhui emphasized the four words of crying and laughing, it should not be a problem with a normal machine, so Wu Bin thought about it and guessed: "Is it because of a mistake in temperature field control?" ”

"It's close." Academician Chen Xianhui nodded, "In the end, they found out that it was because the wild cats in the yard had moved the thermocouple that measured the temperature. ”

"Is that okay?" Wu Bin couldn't help but be stunned after hearing this.

"Yes, the person concerned also felt very devastated, they never dreamed that it would be the reason. But through this incident, it also proves what I said earlier, when working in the laboratory, don't think that those instruments are a black box, it says it's an atomic image, you think it's an atomic image, it says it's temperature, you think it's temperature, that's not the understanding that a physicist should have. ”

"The right attitude to do experiments is that you have to try to make sure that the instrument you're using is transparent to you. A set of instruments in front of you, from its physical principles to its electronic structure to the entire physical process of its work, to its theoretical explanations should be transparent to you, that is called an experiment. ”

'Transparent...... Data ......'

When he heard these two words, a white light seemed to flash in Wu Bin's mind, and a sense of concatenation that was stronger than when he watched the full moon before suddenly appeared in his mind.

"So, the instrument is just an auxiliary, and the person is ......"

Halfway through speaking, Academician Chen Xianhui realized Wu Bin's contemplative expression.

'This little guy has a very similar way to settle in the country. ’

After a long while, Wu Bin, who came back to his senses, looked at Academician Chen Xianhui who was smiling in front of him, and hurriedly said: "I'm sorry, professor, your words just now inspired me a lot, and made me fall into a trance." ”

"Oh? Did you come up with anything? Academician Chen Xianhui asked happily.

"Yes, in fact, I have thought about using the strong adhesion between alumina and two-dimensional iron germanium tellurium and the contact area of Jiaotong University to prepare graphene monolayer samples, but I have been encountering bottlenecks in terms of grid pressure and temperature, I actually have some inspiration to solve this problem two days ago, and I have benefited a lot from what I said to you today, I really thank you very much for your teaching."

Academician Chen Xianhui laughed after hearing this, "If I can make a student burst of inspiration every time I talk, then I will be happy, but I am also very happy that you can feel the benefit from these words so quickly." ”

"Do you particularly want to go to the lab now?"

Wu Bin hurriedly shook his head after hearing this: "No, I still want to talk to you more, I think I will definitely be able to learn many things from you that books and literature can't teach me." ”

"I love to hear that." Academician Chen Xianhui took a sip of hot tea, "But in fact, all I can teach you is the experience I have summarized from countless literature, and I believe you know very well how much knowledge is contained in the literature." ”

"In 1824, when Carnot wrote the first French article on thermodynamics, you will find that Carnot's principle is the most basic sentence 'Any heat conduction that is not for the purpose of doing work is waste', which is the most fundamental principle of thermodynamics.

"Ten years after the invention of this principle, it was read by Claperon in 1834, and he drew the cycle of Carnot's ideal heat engine, and at the end of this article he casually shook off a sentence, saying: 'If heat conduction not for the purpose of work is wasted in any heat engine, then the greatest waste of the kettle boiling water on the stove is not in the kettle, but at the junction of the stove and the kettle.'

"And this sentence waited about 50 years before finally being read by an engineer Diesel that if the greatest waste is at the interface between the stove and the stove, then a good heat engine should not put the stove on the stove, but build the stove into the stove."

"Since then, we have had the internal combustion engine in our world."

"These people are real gold diggers, they find the most important things to learn in physics, which is the inheritance of knowledge, and I also hope that you can also become the next person to dig gold, or become the person who will pass on knowledge."

"The students were taught." Wu Bin nodded respectfully.

PS: February is so short, it's not suitable for me to break out at the end of the month (sigh)