A vacuum pump lowers gas pressure by removing gas from a vessel or trapping it so that it no longer contributes to the free gas population. Mechanical displacement, momentum transfer and capture are distinct operating mechanisms.
Its relevant performance includes pumping speed, attainable pressure and gas dependence. The pressure achieved in an apparatus also depends on connecting vacuum conductance, leaks and outgassing; the pump's advertised limit is therefore not a complete system specification.[ref]
Vacuum Technology for Ion Sources by Paolo Chiggiato. pumping technologies and pressure-profile calculation
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A vacuum pump is a device that removes gas molecules from a sealed volume to create a vacuum, or a space with significantly reduced pressure compared to the ambient atmospheric pressure. It works by extracting air and other gases from a designated area, thus lowering the pressure within that area. **Types of Vacuum Pumps:** 1. **Positive Displacement Pumps**: These pumps create a vacuum by trapping a volume of gas and then expelling it from the system.