ultrahigh$86164$ - definizione. Che cos'è ultrahigh$86164$
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Cosa (chi) è ultrahigh$86164$ - definizione

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

Ultrahigh         
Ultrahigh is a German techno act comprising Cem Oral and Roger Cobernus. Since 1993 they have released several singles and two albums.
Ultra-high-temperature metamorphism         
CRUSTAL METAMORPHISM WITH TEMPERATURES EXCEEDING 900 °C
Ultrahigh-temperature metamorphism
In geology ultrahigh-temperature metamorphism (UHT) is extreme crustal metamorphism with metamorphic temperatures exceeding 900 °C.Brown, M.
Ultra-high-pressure metamorphism         
Ultrahigh-pressure metamorphism
Ultra-high-pressure metamorphism refers to metamorphic processes at pressures high enough to stabilize coesite, the high-pressure polymorph of SiO2. It is important because the processes that form and exhume ultra-high-pressure (UHP) metamorphic rocks may strongly affect plate tectonics, the composition and evolution of Earth's crust.

Wikipedia

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.