Answer:
It is not considered as a vacuum because the space around is not empty the space around it is filled with air like example the space has no air.
The space around is not empty because According to our current understanding all of space is permeated by fields which due to quantum mechanical effects
Vacuum is a space in which there is no matter or in which the pressure is so low that any particles in the space do not affect any processes being carried on there.
Hence vacuum is completely empty but the space around us is not empty.
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