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Vacuum tubeIn electronics, a vacuum tube (American English) or thermionic) valve (British English) is a device generally used to amplify a signal. Once used in most electronic devices, vacuum tubes are now used only in specialized applications. For most purposes, th Vacuum pumpA vacuum pump is a pump that generates vacuum or further reduces the pressure of an existing vacuum. A vacuum pump can be a positive displacement pump that transports a gas load from an inlet port to an outlet, or exhaust, port. Vacuum pumps can also work VacuumThe article on the vacuum cleaner is located elsewhere. In physics, a vacuum is the absence of matter in a volume of space. A partial vacuum is expressed in units of pressure. The SI unit of pressure is the pascal (abbreviated to Pa in usage). It can also Vacuum flask cookingVacuum flask cooking is an invention introduced to the Asian market in the mid 1990s. The vacuum cooker is a stainless steel vacuum flask. The flasks come in various sizes ranging from 20-40 cm (8-16 in) in diameter, and 25 cm (10 in) tall. A removable po Vacuum cleanerA vacuum cleaner is a device that uses an air pump to suck up dust and other small particles of dirt, usually from carpeted floors. Most homes with carpeted floors possess a domestic model for cleaning. The dirt is collected by a filtering system or a cyc Vacuum flaskLunchbox and vacuum bottle owned by Harry S. Truman A vacuum flask or Thermos flask is a bottle that reduces heat transfer from the inside to the outside and conversely to a minimum, and therefore keeps warm drinks warm and refrigerated drinks cold. It wa Vacuum brake Vacuum expectation value Vacuum energy Vacuum Diagrams Vacuum fluorescent display Vacuum chamber Vacuum state Vacuum distillation Vacuum ultracentrifuge