Eli5: If you remove all the air from a chamber, what’s left in the chamber?
In: Other
Nothing, it becomes a vacuum, an area with no gas molecules in it. Depending on the strength of the material the chamber is is made from it might implode as the outside air pressure squeezes it.
Provided that nothing else is in there, the “nothing” left over is what they call Vacuum.
It’s actually just nothing.
When you create a vacuum in a chamber, then the chamber has essentially nothing in it. Of course, we can’t create a perfect vacuum with absolutely nothing in it — even the vacuum of outer space still has a dozen or so atoms per cubic meter, but the answer to *what is left when you remove all the stuff* is **nothing**.
Vacuum. However there is still EM waves and neutrinos passing through. If you are able to remove those there is still the quantum foam.
Here is a good video on the subject.
Simplyfing a lot: you’re left with a region of spacetime where particles of matter and particles of antimatter are locally generated and immediately after annihilate each others, maintaining the average of “nothing”.
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