Also the thing that really blew my mind in vacuum class, was that there really is no such thing as "pulling vacuum". What happens is that the pump removes air molecules from an area, and its the air molecules behind that molecule pushing to fill in that area. Thats what creates the force.
Its like poeple waiting in line. When the gates are opened the poeple suddenly start moving threw the gate. Its not because the gate is sucking them through, its because one person steps through the gate and poeple behind him move up to fill in the hole he created. Its not that the air molecules have a mid of their own to step through the gate, its the "normal" 14.7 PSI of pressure that always pushing down that forces them through the gate.
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