ultrahigh vacuum - ορισμός. Τι είναι το ultrahigh vacuum
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Τι (ποιος) είναι ultrahigh vacuum - ορισμός

ARTIFICIAL VACUUM WITH VERY LOW PRESSURE
Ultrahigh vacuum; Ultra high vacuum; UHV manipulator

Ultra-high vacuum         
Ultra-high vacuum (UHV) is the vacuum regime characterised by pressures lower than about . UHV conditions are created by pumping the gas out of a UHV chamber.
vacuum cleaner         
  • Train-mounted vacuum system for track cleaning (France)
  • Wet/dry vacuum for home use
  • The power unit of a typical [[central vacuum cleaner]] for residential use
  • isbn=9780786465521}}</ref>
  • A typical low-cost upright vacuum
  • Patent model of Daniel Hess's carpet sweeper
  • Hoover Constellation of 1960
  • Astronaut [[Tracy Caldwell Dyson]] vacuums equipment on the [[International Space Station]]
  • Kirby]] G5 vacuum cleaner
  • Early electric vacuum cleaner by Electric Suction Sweeper Company, {{circa}} 1908
  • A [[Mid-century modern]] styled canister vacuum
  • USB-powered hand-held vacuum cleaner (promotional giveaway).
  • An early hand-pumped vacuum cleaner
  • Housemaid]] using "dedusting pump", {{Circa}} 1906.
  • A hand-powered pneumatic vacuum cleaner, {{circa}} 1910. An early electric-powered model is also shown
  • A full dustbag. The frame around the opening fastens to the interior end of the cleaner's hose inlet.
DEVICE THAT SUCKS UP DUST AND DIRT FROM FLOORS
Vacuum Cleaner; Vacuum cleaners; Vacuum Cleaners; Wet/dry vacuum; Hoovering; Vaccum cleaner; Dust sucker; Vacuumming; Vacuum cleaning; Vacuum sweeper; Vacuum belt; Vacuum filter; Vacuum Filter; Vacuum machine; Daniel Hess; Hoover Constellation; Shop vac; Shop-vac; Shop Vac; Shop-Vac; Shop vacuum; Shop vacuum cleaner; Vaccuum cleaner; Hoover (vacuum cleaner); Cyclonic vacuum cleaner; Vacuuming; Kruimeldief; Kruimeltjesdief
also vacuum-cleaner (vacuum cleaners)
A vacuum cleaner or a vacuum is an electric machine which sucks up dust and dirt from carpets.
N-COUNT
Vacuum engineering         
TECHNOLOGY TO LOWER GAS PRESSURES FOR VARIOUS TECHNICAL AND SCIENTIFIC PURPOSES
Vacuum equipment; Vacuum system
Vacuum engineering deals with technological processes and equipment that use vacuum to achieve better results than those run under atmospheric pressure. The most widespread applications of vacuum technology are:

Βικιπαίδεια

Ultra-high vacuum

Ultra-high vacuum (UHV) is the vacuum regime characterised by pressures lower than about 100 nanopascals (1.0×10−7 Pa; 1.0×10−9 mbar; 7.5×10−10 Torr). UHV conditions are created by pumping the gas out of a UHV chamber. At these low pressures the mean free path of a gas molecule is greater than approximately 40 km, so the gas is in free molecular flow, and gas molecules will collide with the chamber walls many times before colliding with each other. Almost all molecular interactions therefore take place on various surfaces in the chamber.

UHV conditions are integral to scientific research. Surface science experiments often require a chemically clean sample surface with the absence of any unwanted adsorbates. Surface analysis tools such as X-ray photoelectron spectroscopy and low energy ion scattering require UHV conditions for the transmission of electron or ion beams. For the same reason, beam pipes in particle accelerators such as the Large Hadron Collider are kept at UHV.