Quote:
Originally Posted by GH85Carrera
It is called air pressure. The atmosphere is forced into the system by the few miles of air above your head.
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The equal to atmospheric pressure in the system immediately after discharge (without mechanical evacuation, i.e., no vacuum) pushes back with the same force.
It will not rush in. It will mingle.
Pull a vacuum and THEN bust open the system you got moisture throughout instantly.
There is no argument to not pull a vacuum for atmospheric air is dead space and it's not intended to be there by system design.