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"vacuum " what is it?

"vacuum " what is it? 

Vacuum tube                                         

Vacuum, space during which there's regardless of or during which the pressure is so low that any particles within the space don't affect any processes being carried on there. it's a condition well below normal air pressure and is measured in units of pressure (the pascal).

Vacuum in space                           

 A vacuum are often created by removing air from an area employing a air pump or by reducing the pressure employing a fast flow of fluid, as in Bernoulli’s principle.
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