roughing-down pump
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Sorption pump — The sorption pump is a vacuum pump that creates a vacuum by adsorbing molecules on a very porous material like molecular sieve which is cooled by a cryogen, typically liquid nitrogen. The ultimate pressure is about 10 2 mbar. With special… … Wikipedia
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
hand tool — any tool or implement designed for manual operation. * * * Introduction any of the implements used by craftsmen in manual operations, such as chopping, chiseling, sawing, filing, or forging. Complementary tools, often needed as auxiliaries to… … Universalium
Inductively coupled plasma mass spectrometry — ICP MS Instrument Acronym ICP MS Classification Mass spectrometry Analytes atomic and polyatomic species in plasma, with exceptions; usually inte … Wikipedia
Transmission electron microscopy — A TEM image of the polio virus. The polio virus is 30 nm in size.[1] Transmission electron microscopy (TEM) is a microscopy technique whereby a beam of electrons is transmitted through an ultra thin specimen, interacting with the specimen as it… … Wikipedia
Bicycle — For other uses, see Bicycle (disambiguation). A mountain bike, a popular multi use bicycle. A bicycle, also known as a bike, pushbike or cycle, is a human powered, pedal driven, single track vehicle, having two wheels attached to a frame, one… … Wikipedia
Surfing — This article is about stand up ocean surfing. For other uses, see Surfing (disambiguation). A surfer performing a late drop … Wikipedia
Nuclear reactor safety systems — This article covers the technical aspects of active nuclear safety systems. For a general approach to nuclear safety, see nuclear safety. The three primary objectives of nuclear reactor safety systems as defined by the Nuclear Regulatory… … Wikipedia
Glossary of American football — The following terms are used in American football and Canadian football, but see also the glossary of Canadian football. Contents: 0–9 A B C D E F G H I J K L M N O P Q R S T U V … Wikipedia
Trickling filter — A trickling filter consists of a fixed bed of rocks, gravel, slag, polyurethane foam, sphagnum peat moss, or plastic media over which sewage or other wastewater flows downward and causes a layer or film of microbial slime to grow, covering the… … Wikipedia
Cryopump — A cryopump is a vacuum pump that traps gases and vapours by condensing them on a cold surface. They are only effective on some gases, depending on the freezing and boiling points of the gas relative to the cryopump s temperature. They are… … Wikipedia
