Is vacuum a medium

Answer 1

Vacuum is not a medium. Considering waves, mechanical waves require a medium (such as air) to travel. Electromagnetic waves (such as visible light and radio waves) do not require a medium, and are the only waves (that we know of) that can travel through a vacuum. I have heard of a gravity wave, which may be a third type of wave. I don't know much about them. These would also travel through a vacuum.

Answer 2

The concept of vacuum is much uncertainty in physics. The most important is to define the relationship of vacuum and matter. The polarization of vacuum is inspiring effect on the relationship between vacuum and matter. The concept of matter like the concept of sound, is phenomenon named by people. The nature of matter can be described on fundamental concept of curvature space. If vacuum is considered as plat space, the vacuum is also the medium of curvature space. My paper "The postulate of vacuum as the medium of matter waves and the extension of the equivalence principle" gives a more detail information.

Answer 3

No, vacuum is the absence of matter, including particles and molecules. It does not serve as a medium for transmitting sound or light waves.

Answer 4

No, it is the absence of any medium.