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Published online by Cambridge University Press: 14 March 2018
Pressure scales can be extremely confusing to new operators. This is not surprising. To my mind, there are three primary areas of confusion.
Firstly, the pressure of gas inside an instrument changes over many orders of magnitude during pump-down. The change is about 9 orders of magnitude for a traditional Scanning Electron Microscope and about 13 orders of magnitude for an ultra-high vacuum instrument such as a Scanning Auger Microprobe.