The only common thing between the physical vacuum and the technical vacuum is that they both can exist only in a 3D space volume. The technical vacuum is a vacuum space containing a very small quantity of molecules or atoms. Its characteristics are the volume and quantity of the molecules (or atoms). The main characteristics of the physical vacuum, however, are quite different: a propagation of gravitation, electrical and magnetic fields and inertial properties of the atomic matter. The physical vacuum may contain or may not contain atoms, molecules, gases, liquids and solids. In either case, however, the main characteristics of the physical vacuum are preserved. The physical vacuum is also distinguished from a pure empty space that evidently exists in the Universe according to the BSM analysis. A pure empty space has only a space volume but not possessing any of the above mentioned features of the physical vacuum. Any kind of radiation we know from experience is not able to propagate in the pure empty space.
The above mentioned features comply to the human logic of study and understanding of the real world. The mentioned above characteristics are only part of the properties of the space in which we live, but they provide a solid base for understanding of the correct vacuum concept and its enormously important role in the process of understanding the Nature and Universe.
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