It is only by examining the differences at a molecular level between the various vacuum levels that one can begin to appreciate the challenges associated with achieving and working with high vacuum HV , ultra-high vacuum UHV and extreme high vacuum XHV. Discover more about the underlying concepts and principles of vacuum generation in our eBook:. The pressure range of XHV is usually defined as 10 mbar and lower, while UHV is between 10 -7 and 10 mbar, and HV between 10 -7 and 10 -3 mbar. As one would expect, the established norms, rules and protocols that define and govern vacuum factors and matters, from how to obtain such vacuum levels, the pump set-up, safeguards, measurement methods, as well as leak detection, must all be thoroughly re-examined and frequently re-engineered. At the HV, UHV and XHV end of the vacuum spectrum, the most important contribution to pressure reduction and vacuum retention is that associated with outgassing. Outgassing, which is a major problem in HV, UHV and XHV systems, is the result of the desorption of previously adsorbed molecules, by bulk diffusion, permeation and vapourisation. Outgassing can occur from two sources: surfaces and bulk materials.
The Fundamentals of High, Ultra-High & Extreme High Vacuum
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Welcome to our vacuum category! Of course, others might look more professional because they were done by pro photographers and everything will be incredible: light, position, scenery, models… Whatever your preferences are you will surely find something interesting in this category! All these photos are free for viewing and you can enjoy in them without worrying about payment and membership. You will surely notice that some photos in this vacuum category are soft core while others are hard core; we like to keep it that way just to have some variety because you never know what makes you tick.