优选词，正式主题词
Ultra High Vacuum (UHV)
定义
某概念特定涵义的完全解释- 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)
上位概念
上位概念其它语言
其它语言中概念术语- Ultra High Vacuum (UHV)
URI
https://purls.helmholtz-metadaten.de/skosmos/sdv/UHV