From GAWDAwiki
A vacuum pump is a device used to remove air from a contained space. It is available in two models: a compressed-air pump and an electromechanical pump.
- Compressed air pumps, also called generators, force compressed air through a nozzle, creating a vacuum when it reacts with high-pressure outside air.
- Electromechanical pumps are commonly found in the rotary-vane model. These pumps use a rotor and vanes to trap air and force it through a pump, creating a partial vacuum.[1]
References
- http://www.wisegeek.com/what-is-a-vacuum-pump.htm
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