Sam's Laser FAQ - Amateur Laser Construction - K3PGP
Note that it is the difference between atmospheric pressure and that of your vacuum that determines the stress on the container - whether you are pumping down to 10 Torr or 1E-14 Torr is for all ... And, don't overlook simple hazards like the rotating parts of your mechanical pump or the hot surfaces of an oil diffusion pump!
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k3pgp's website is k3pgp.org