What is physical condition of the Aether/Vacuum?

Answer 1

Traditionally, a Vacuum is defined as a region containing nothing. Is there really such a region? In classical physics, 'matter' and 'energy' were regarded as seperate entities. So vaccum was thought of as a region free any matter particles. In classical Physics the practical problem of creating a Vacuum was very well recognised. One cannot really create a region absolutely free of matter, but one can get very close to emptying a region in space of matter. So it was question of degree. So a Vaccum was to be thought of in a similar way as we think of say a Sphere. We know what a sphere is, and there cannot be a perfect sphere in the real world. But its useful concept and the question is how close we can get to an ideal sphere. And the closest we can come to Vaccum according to this view would we the space between Galaxies.
But in Modern Physics, which includes 'Relativity' and 'Quantum Theory', 'Matter' and 'Energy' are equvivalent and interconvertable. What was thought of before as 'Fields' were now thought of as considering 'Virtual' (massless) Particles. And matter particles could be created out of these Virtual Partcles. So even if you have say a glass container devoid of any mattter partcles, the fact that light and gravitational fields can enter the container would not make it a Vacuum. Even if you were to consider an empty container, how do you shut-out Gravity ? And matter particles can in theory spring from these Virtual particles which have entered. Moreover, space itself is considered as a mutable entity. Would that count? In classical theory, a Vaccum was atleast in principle possible. But in modren physics, a vacuum is not even possible in principle!
So where does all this leave us? Well, it seems we should regard Vacuum as a 'Classical' concept which is useful when we apply classical physics in certain less demanding situations. But any serious consideration would soon make it clear that a vaccum is not possible even in principle !

Answer 2

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Answer 3

Some of the newer theories predict that even "empty" space is filled with "virtual particles" that pop into and out of existence. If these are true, there is no such thing as empty nothingness.

Answer 4

Nothing, just absolutely nothing. Zero mass, zero energy, zero tempertaure, just plain zero.

Answer 5

it has no physical condition