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| Results 1 - 10 of about 2523 for the
Vacuum
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In quantum field theory , the vacuum state (also called the vacuum ) is the quantum state with the lowest possible energy . As a result, it contains no physical particles. Conventionally it has zero energy (see however cosmological constant ). For a relativistic field theory, the vacuum is Poincaré invariant . If the field theory can be accurately described through perturbation...
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Canister vacuum cleaner A vacuum cleaner is a device that uses an air pump to create a partial vacuum to suck up dust and dirt, usually from carpeted floors. Most homes with carpeted floors possess a domestic model of vacuum cleaner for cleaning. The dirt is collected by a filtering system or a cyclone for later disposal. Table of contents showTocToggle("show","hide"...
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This industry -related article is a stub . You can help Wikipedia by expanding it . A vacuum oven is a sealed chamber in which the pressure is lowered and the temperature is raised. One use of such an oven is to remove volatiles and bound gases from surfaces. Another is to heat a substance in an oxygen-poor environment to reduce oxidation.
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A power vacuum is an expression for a political situation that can occur when a government has no identifiable central authority. During or following a civil war there is often a power vacuum of some sort. For example, the war-torn nation of Somalia is currently mired in a power vacuum of sorts, with no central government or president exercising control over the supposed "Republic of Somalia"...
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In electronics , a vacuum tube (American English) or (thermionic) valve (British English) is a device generally used to amplify , or otherwise modify, a signal by controlling the movement of electrons in an evacuated space. Once used in most electronic devices, vacuum tubes are now used only in specialized applications. For most purposes, the vacuum tube has been replaced by the much...
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An Atmospheric Vacuum Breaker ( AVB ) is a backflow prevention device used in plumbing to prevent backflow of non-potable liquids into the potable (drinking water ) system. It is usually constructed of brass and resembles a 90 degree elbow with a hood on its top to allow air to enter the water system if a siphon attempts to form.Inside this elbow is a poppet valve that is held "up"...
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Ultra high vacuum is that regime of vacuum characterised by pressures lower than about 10 -9 torr (0.1 micropascal or 100 nanopascals). Contents showTocToggle("show","hide") 1 Concepts Involved 2 Degrees of vacuum 3 Typical uses for ultra high vacuum 4 Types of pumps 5 Keys to achieving UHV 6 See also 7 External links Concepts...
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Canister vacuum cleaner A vacuum cleaner is a device that uses an air pump to create a partial vacuum to suck up dust and dirt, usually from carpeted floors. Most homes with carpeted floors possess a domestic model of vacuum cleaner for cleaning. The dirt is collected by a filtering system or a cyclone for later disposal. Contents showTocToggle("show"...
http://www.allaboutall.info/article/Vacuum cleaner
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In quantum field theory the vacuum expectation value (also called condensate ) of an operator is its average, expected value in the vacuum . The vacuum expectation value of an operator O is usually denoted by . This concept is important for working with correlation functions in quantum field theory . It is also important in spontaneous symmetry breaking . Examples are: The Higgs...
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A vacuum fluorescent display ( VFD ) is a type of display used primarily on consumer-electronics equipment such as video cassette recorders . Unlike liquid crystal displays , a VFD emits a very bright light with clear contrast. The device consists of a cathode ( filaments ), anodes ( phosphor ) and grids encased in a glass envelope under a high vacuum condition. The cathode...
http://www.allaboutall.info/article/Vacuum fluorescent display
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Also helps finding: vacum, vacuumm, vakuum, vacuuum, vacuumn, vacuam, vaacuum, acuum, vcuum, vauum, vacum, vacum, vacuu, dacuum, facuum
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