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VacuumA vacuum is a volume of space that is essentially empty of matter, such that its gaseous pressure is much less than standard atmospheric pressure. The Latin term in vacuo is used to describe an object as being in what would otherwise be a vacuum. The root of the word vacuum is the Latin adjective vacuus which means "empty," but space can never be perfectly empty. A perfect vacuum with a gaseous pressure of absolute zero is a philosophical concept that is never observed in practice, partly because quantum theory predicts that no volume of space can be perfectly empty in this way. Physicists often use the term "vacuum" slightly differently. They discuss ideal test results that would occur in a perfect vacuum, which they simply call "vacuum" or "free space" in this context, and use the term partial vacuum to refer to the imperfect vacua realized in practice.The quality of a vacuum is measured in relation to how closely it approaches a perfect vacuum. The residual gas pressure is the primary indicator of quality, and is most commonly measured in units called torr, even in metric contexts. Lower pressures indicate higher quality, although other variables must also be taken into account. Quantum mechanics sets limits on the best possible quality of vacuum. Outer space is a natural high quality vacuum, mostly of much higher quality than what can be created artificially with current technology. Low quality artificial vacuums have been used for suction for millennia. Vacuum has been a frequent topic of philosophical debate since Ancient Greek times, but was not studied empirically until the 17th century. Evangelista Torricelli produced the first artifical vacuum in 1643, and other experimental techniques were developed as a result of his theories of atmospheric pressure. Vacuum became a valuable industrial tool in the 20th century with the introduction of incandescent light bulbs and vacuum tubes, and a wide array of vacuum technology has since become available. The recent development of human spaceflight has raised interest in the impact of vacuum on human health, and on life forms in general. (From the Wikpedia article Vacuum.) Download PDF containing detailed information.
Recent Publications on Vacuum: |  |
Ca(6)Gd(1.5)Tb(0.5)Na(2)(PO(4))(6)F(2)-an intense green-emitting phosphor under vacuum ultraviolet and low-voltage cathode ray excitation.
The investigations on photoluminescence and cathodoluminescence reveal... | 21st November, 2009
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| Opt Lett. 2009 Nov 15;34(22):3466-3468. doi: 10.1364/OL.34.003466.
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Controlling the Expansion into Vacuum-the Enabling Technology for Trapping Atmosphere-Sampled Particulate Ions.
A new inlet has been designed to control the kinetic energy distributions... | 21st November, 2009
| Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA.
| J Am Soc Mass Spectrom. 2009 Oct 21.
DOI Direct Link |
Characterization of the interphase in an aluminium/epoxy joint by using controlled pressure scanning electron microscopy coupled with an energy dispersive X-ray spectrometer.
The aim of this work is to introduce the use of low vacuum scanning... | 21st November, 2009
| LTI, Centre de Recherche Public Henri Tudor, 66 Rue de Luxembourg BP 144,
| Micron. 2009 Oct 21.
DOI Direct Link |
The optimal mode of delivery for the haemophilia carrier expecting an affected infant is vaginal delivery.
Summary. The optimal mode of delivery of a haemophilia carrier expecting a... | 21st November, 2009
| Departments of Paediatrics and Coagulation Disorders, Lund University,
| Haemophilia. 2009 Nov 18.
DOI Direct Link |
On the ionization and dissociative photoionization of iodomethane: a definitive experimental enthalpy of formation of CH(3)I.
The dissociative photoionization onset energy of the CH(3)I --> CH(3)(+) +... | 20th November, 2009
| Paul Scherrer Institut,
| Phys Chem Chem Phys. 2009 Dec 14;11(46):11013-11021. Epub 2009 Oct 16.
DOI Direct Link |
→View more research publications. |
Press Releases About Vacuum:
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| Multitask Productions, LLC Releases the SqueezeItIn.com Workout DVD - Exclusive New Multi-Feature DVD Launches SqueezeItIn.com Online Store |
19th November, 2009 |
Multitask Productions, LLC |
WASHINGTON, Nov. 19 /PRNewswire/ -- Multitask Productions, LLC and SqueezeItIn.com - the website that shows you how to "let life be your workout!" with clever, effective exercises you can do
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| Reportlinker Adds Laboratory Pumping Systems - Global Market Opportunities |
18th November, 2009 |
Reportlinker |
NEW YORK, Nov. 18 /PRNewswire/ -- Reportlinker.com announces that a new market research report is available in its catalogue.
Laboratory Pumping Systems - Global Market Opportunities
http://www
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| Varian, Inc. Reports Second Quarter 2009 Results |
29th April, 2009 |
Varian, Inc. |
PALO ALTO, Calif., April 29 /PRNewswire-FirstCall/ -- Varian, Inc. (NasdaqGS: VARI) today reported second quarter fiscal year 2009 revenues of $205.4 million, a decrease of 17.2% from the second
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| EnWave Announces Collaboration and Initial Testing Results with Danisco AS |
7th April, 2009 |
EnWave Corporation |
VANCOUVER, April 7 /PRNewswire-FirstCall/ - EnWave Corporation (TSX-V: ENW) ("EnWave" or "the Company") today announced the successful completion of tests using its recently
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| EnWave Successfully Commercializes nutraREV(TM) Food Dehydration Technology |
2nd March, 2009 |
EnWave Corporation |
Innovative B.C. Technology Promises to Revolutionize Food Processing
Industry
VANCOUVER, March 2 /PRNewswire-FirstCall/ - EnWave Corporation (TSX-V: ENW) ("EnWave" or "the
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Companies working in the area of Vacuum from Bioportfolio's Biocorporate database : | |
| Company Name | |
Intermagnetics, drawing on the financial strength, operational excellence and technical leadership in its core businesses of Magnetic Resonance Imaging and Instrumentation has become a prominent...
www.intermagnetics.com/ View full profile
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Kendro Laboratory Products - A worldwide company formed by the merger of Heraeus Instruments and Sorvall.
Corporate description
Kendro Laboratory Products is a...
www.kendro.com/ View full profile
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Structure Probe, Inc. was founded in April, 1970 by Charles A. Garber, Ph. D., who is still the President and Chief Executive Officer of the firm.From the starting point of one of the first scanning...
www.2spi.com/ View full profile
| | →View more Vacuum related companies. |
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Wikipedia excerpt, where present, licenced under the GNU Free Documentation License. Resources from the NCBI applied. Selected MeSH subject headings created and maintained by the US NLM are used in conjunction with additional keywords. 2006-2008 MeSH.
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