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| Results 41 - 50 of about 2523 for the
Vacuum
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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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The characteristic impedance of vacuum ( ) is, as it sounds, the characteristic impedance of vacuum . It is a physical constant defined by: where: - magnetic constant - speed of light In SI units, the value is exactly expressed by: = 1.199 169 832 · π · 10 2 Ω References " NIST - CODATA 2002 recommended values ...
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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 For most purposes, the vacuum tube has been replaced by the much...
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In quantum field theory , the vacuum state may be degenerate . Each pure vacuum state generates its own superselection sector , of course. The space of all pure vacuum states often has a manifold structure and is called the vacuum manifold . Vacuum manifolds arise during the process of spontaneous symmetry breaking from a group G to a subgroup H and the corresponding vacuum manifold has to...
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vacuum mattress and its manual pump A vacuum mattress (vacmat) is a medical device used for the immobilisation of patients, especially in case of vertebra , a pelvis or a limb trauma (especially for femur trauma), as well for hand transportation of patients on short distances (it replaces the stretcher ). It was invented by Loed and Haederlé, who called it "shell" mattress ( matelas...
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For other uses, see vacuum cleaner and Vacuum (musical group) . The root of the word vacuum is the Latin word vacuum (pl. vacua ) which means a space devoid of matter. In physics , a vacuum is the absence of matter in a volume of space . Contents showTocToggle("show","hide") 1 Vacuum ranges 2 Perfect vacuum 3 Partial vacuum 4 Degrees of vacuum 5 Creating...
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Manifold vacuum , or engine vacuum in an internal combustion engine is the difference in air pressure between the engine's intake manifold and Earth's atmosphere . Manifold vacuum is an effect of choked flow through a throttle in the intake manifold of an engine. It is a measure of the amount of restriction of airflow through the engine, and hence of the unused power capacity in the...
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... cleaned up to conform to a higher standard of quality. This article has been tagged since April 2005. See How to Edit and Style and How-to for help, or this article's talk page. A vacuum gauge is used to measure the pressure in a vacuum , which is broadly divided into two categories: high and low vacuum (and sometimes ultra-high vacuum ). Many of the different techniques used...
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Vacuum is a Swedish synth pop musical group formed in 1996 by Alexander Bard . The history of the group can be divided into two distinct parts: before the departure of the group's leader Alexander Bard in 1999 and after his departure, since which the singer Mattias Lindblom has become the group's new leader. The first two full albums of 1997 and 1998 were characterized...
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In General relativity , a vacuum solution is a Lorentzian manifold whose Einstein tensor vanishes identically. According to the Einstein field equation , this means that the stress-energy tensor also vanishes identically, so that no matter or non-gravitational fields are present. More generally, a vacuum region in a Lorentzian manifold is a region in which the Einstein tensor vanishes...
http://www.allaboutall.info/article/Vacuum solution (general relativity)
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Also helps finding: vacuim, vacuhm, vacujm, vacukm, vacuam, vacuuh, vacuuj, vacuuk, vacuun, vdacuum, vfacuum, vgacuum, vcacuum, vbacuum, vwacuum
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