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High Vacuum (HV)  

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  • 1. High vacuum refers to a pressure low enough that the mean free path (the distance traveled between collisions) of molecules in the residual gas is greater than the dimensions of the vacuum vessel. (Britannica). 2. A vacuum with pressure in the range from 100 mPa to 100 nPa (Wikipedia).

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https://purls.helmholtz-metadaten.de/evoks/sdv/HighVacuum

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