You’ve probably heard that everything on the universe is made up of atoms and all other normal matters in the Universe are mostly empty space, and atoms are 99.9999999% empty space. That’s actually true.
We know that we humans and the walls are made of atoms, so, they are mostly empty space. And if that’s true why can’t we pass through that empty space?
It’s all about atoms. Atoms are made of electrons and a nucleus containing protons and neutrons. Electrons that orbit the nucleus of an atom. Drawings of atoms show electrons buzzing around a nucleus in a nice neat pattern. Here is the picture of an atom. We usually see atoms like this, but these sketches are nowhere near to scale.
We also know that electrons are much smaller than the nucleus. And the nucleus and the electrons would be too small to even see. It’s usually illustrated that electrons orbit around the nucleus just like our planet orbits the sun. But in actuality, electrons swarm around that empty space in cloud formations.
In order to pass through another atom, the electrons of the first atom would have to exist – however briefly – in the same atomic space as the electrons of the second atom. And, put simply, this is impossible.
Anyway, two things cannot exist in the same place at once and the same goes for electrons. This theory is called the Pauli Exclusion Principle. No two electrons can be in the same state or configuration. On a basic level, this is why you can’t walk through walls. It also means that atoms are pretty effective at blocking other atoms from getting all up in their space. It was formulated by Austrian physicist Wolfgang Pauli in 1925.
This is what makes solid objects solid, and keeps them from passing through each other.
You know how the negative end of a magnet repels other negative magnets? That’s what’s happening when you try to touch anything. It’s like there’s a little invisible force field between you and everything you touch. It’s poked and prodded, but never broken. It’s the same with everything else in the universe too.
Now, you obviously can’t, but if you were to actually walk through a wall. Electrons are fermions and have to obey the Pauli Exclusion Principle. But bosons, another type of subatomic particle, don’t. And if fermions started acting like bosons, the Universe would be a very weird place.
There’s still quantum tunneling, which is where a very tiny particle can make its way across a barrier even though, according to classical mechanics, it doesn’t have the energy to do so. And this isn’t just some wacky idea — tunneling is used in scanning tunneling microscopes.
Basically, electrons have a small probability of tunneling between the surface of the solid and a tiny tip on the microscope.
If you wanted to use the phenomenon to walk through walls, you’d need every single particle in your body to tunnel through the barrier. And sadly, the probability of that happening is very, very small.
This article is made from the youtube video. If you are interested then you can enjoy it.