What else is in a vacuum? What does vacuum mean? Is vacuum just nothing?

This is a complex question, even Hawking is thinking about it, and I can only give a general idea: such as gravitational fields, light, various types of cosmic rays, space, and dark matter that cannot be discovered but may exist at present. In addition, I personally think that time should not be considered matter, after all, at present it can only exist as a single axis, but it is related to the three axes of space.

In the theory of relativity, space is distorted, and I agree with it, because at the current level of science, the distortion of space seems to be the best answer if gravity cannot be solved, so space is considered a substance. But time is different, and the premise of time distortion with the speed of light as the speed of motion is not possible at present, and it is impossible to know whether time can be distorted as a substance. Speaking of which, what else in the vacuum (the universe) of the questioner has represented the peak of human science, of course, it is not clear in one or two sentences, it is recommended to read popular science books such as "A Brief History of Time" or "The Theory of Relativity", after all, this topic is still very interesting

There is space and time

Vacuum is a substance, philosophical thought, understand.

Depending on your definition of vacuum, in a narrow sense, it means nothing, really empty.

Broadly speaking, there should be energy, but no matter.

Hehe! Vacuum is just no air! Everything else can be had. For example, if there are feathers and stones of the same mass in a vacuum bottle, they will fall from one end to the other as fast under gravity.

One of the most striking facts is that the interior of the atom is mostly empty. If the diameter of the atom is the same as the length of your arm, the electrons will be dancing in the space surrounded by your arm, and the nucleus will be in the center, smaller than the diameter of a hair. So the fact that you and I, and all the atoms in the universe that appear to be solid, are basically empty, is puzzling, but what is even more incredible is that empty space is not empty.

The elementary particles that make up protons and neutrons, as well as quarks, interact through gluons.

In a vacuum, we see a soup of a huge fluctuating quantum field, changing very quickly. What we usually think of as empty space is actually filled with quarks and gelon field fluctuations. It sounds incredible.

Quantum fluctuations can help us understand the behavior of elementary particles, for example. Are you most likely to find quarks in **? Quarks are at the top of those quantum fluctuations, and those bubbles appear and disappear so quickly that you can think of quarks as popping up from one bubble to another.

It is more difficult to improve the vacuum. On the one hand, any container has a connecting part, it is impossible to achieve absolute sealing, a very small leakage will cause the outside air to penetrate, and finally the pumping speed and leakage rate reach a dynamic equilibrium, and the vacuum degree can no longer be improved. On the other hand, hydrogen molecules are released from the walls of the container, and these light gases cannot be removed by these means.

As a result, the amount of hydrogen in the container increases, while the vacuum cannot be increased.

The above is a detailed interpretation of the problem, I hope it will help you, if you have any questions, you can leave me a message in the comment area, you can comment with me, if there is something wrong, you can also interact with me more, if you like the author, you can also follow me, your like is the biggest help to me, thank you.

Vacuum is a state of space, but also a physical phenomenon, vacuum does not mean that there is no matter, but it also has another layer that means that there is no form of energy, but theoretically it does not exist under the real conditions of existence.

Vacuum means that there is no air, no substance, and it is very clean. There is nothing in the vacuum, not even some microorganisms.

A vacuum is a space where there is no gas, or very little gas, and all objects are at a standstill. No, a vacuum doesn't mean there's nothing left.

Vacuum refers to the space where there is no gas, or there is little gas, and the object is in a state of containment. Just because it's not a vacuum doesn't mean there's nothing left.