Ultra High Vacuum (UHV)

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1. Ultra-high vacuum (often spelled ultrahigh in American English, UHV) is the vacuum regime characterised by pressures lower than about 1×10−6 pascals (1.0×10−8 mbar; 7.5×10−9 Torr). UHV conditions are created by pumping the gas out of a UHV chamber. (Wikipedia). 2. UHV stands for Ultra High Vacuum. As the vacuum is the absence of material, what is in fact measured is the pressure of residual gas in the chamber. Vacuum represents particle density lower than the atmospheric pressure. Three different units are commonly used: Pa, Torr and mbar (1 Pa is 7.5.10-3 Torr and 1.10-2 mbar). The vacuum “quality” is classified in 3 ranges: Rough, high and Ultra high Vacuum (https://www.orsayphysics.com/what-is-uhv)

https://purls.helmholtz-metadaten.de/skosmos/sdv/UHV

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