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If two electrons are placed very close together, they will produce a very strong repulsive force to prevent them from falling into the same state.
This video is an excerpt from the live broadcast of Professor Yuan Lanfeng on the theme of "Principles and Technologies of Quantum Information" on September 11, 2021
(Why has quantum, which was proposed a hundred years ago, suddenly become a hot topic |? Technology Yuan Ren)
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Released on October 1, 2021, this video has reached 24.995 million views and 7.1w likes
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Why does matter have hardness, that is to say, why are there solids in the world? Let's say this brick, or this piece of steel, why is it hard? The question is actually equivalent to saying that these atoms are so close to each other that why would they push away and not fall together, right?
The answer to this question is that because there is a particle called a fermion, for example, an electron is a fermion, and the fermion is called a boson, and Fermi and Bose are two famous physicists, and the characteristic of fermions is that they have to satisfy this bubble of incompatibility, and if you get too close to each other, they will push each other apart, that is, they cannot fall into the same state.
If you put two electrons very close together, they will have a very strong repulsive force to prevent them from falling into the same state, right? So this explains why solids appear in the world.