vacuum forepump

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vacuum technology — Introduction all processes and physical measurements carried out under conditions of below normal atmospheric pressure. A process or physical measurement is generally performed in a vacuum for one of the following reasons: (1) to remove the … Universalium
forepump — ˈ ̷ ̷ˌ ̷ ̷ noun Etymology: fore + pump : a vacuum pump auxiliary to a more effective pump for which it supplies a first stage of exhaustion called also backing pump … Useful english dictionary
Diffusion pump — Six inch oil diffusion pump. Diffusion pumps use a high speed jet of vapor to direct gas molecules in the pump throat down into the bottom of the pump and out the exhaust. Presented in 1915 by Wolfgang Gaede[1] and using mercury vapor, they were… … Wikipedia

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