With the memories, Ding Xuan's thoughts returned to a physics class in junior high school.

The physics teacher was standing on the podium, and there were some items on the podium, and the physics teacher said that he was going to do an experiment for everyone. The physics teacher first poured a full glass of water into the cup, then took out a piece of bread and asked the students what would happen to the water in the cup if he put the bread in the cup. The first reaction of the students was that the water would overflow. At first, Ding Xuan also thought so, but isn't it, the water in the cup is already full, and if you add something to it, then the water will definitely overflow. The teacher smiled, did not speak, and then tore a little bread, slowly put it into the water, the students were surprised to find that the water in the cup not only did not overflow, but a little less than just now, the teacher tore a little bread and put it into the cup, the water in the cup was a little less than before, the teacher put bread in the cup little by little, and when a whole piece of bread was put into the cup little by little, the students were surprised to find that the water in the cup was nearly half.

Exclamations came from the mouths of the students, "Teacher, what's going on, why is there less water in the cup?" The students asked their questions. The physics teacher looked at everyone and said with a smile, "Because water and bread are made up of tiny particles that we can't see with our naked eyes." In our eyes, the water in the cup is full, but in fact, there are still gaps in the water in the cup, some students will ask, where does such a tight water come from, but the fact is that the water we see with the naked eye is composed of a very small particle that we cannot see with the naked eye - water molecules, and there are gaps between the molecules. Bread is also made up of molecules with voids, so when bread is thrown into water, the two molecules are rearranged, the gaps between the molecules are reduced, and once the gaps between the molecules are reduced, the volume of the object made of the molecules will also be reduced. So I put the bread in the filled water, and instead of overflowing, the water became less light. Now everyone understands, right? ”

"I see." The students all nodded as if they didn't understand.

"It seems that you still don't understand very well, okay, then let's start today's lesson, today we are going to learn about the basic building blocks of objects - molecules. I believe that after this lesson, everyone will fully understand the principle of this experiment. ”

Ding Xuan thought of today's language test, and the article on the test paper introduced molecules, atoms, quarks, etc., the main members of the microscopic world. Ding Xuan boldly guessed that if our world is a conventional world, then the molecular layer belongs to the microscopic world. In the conventional world, it is impossible for one to see tiny objects with the naked eye without any instruments. But in the microcosm, it is normal for such tiny objects to be seen. If a person is only the size of a molecule, it is not surprising that he can see the molecule. And he will also see the huge gaps between the molecules that make up the object.

Thinking of this, Chu Yu summed up the principle of perspective that he had comprehended. That is, objects are made up of molecules, and there are gaps between molecules, as long as you look through the gaps, you can see the opposite side of the object composed of these molecules!

This book was first published on Kanshu.com