Quote:
Originally Posted by SilberUrS6
Oh, dear lord.
I work with vacuum in the 1x10^-7 all the time - vacuum manifolds evacuated with turbomolecular pumps.
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And I went 10^-8 Torr with 2 36 inch diffusion pumps (no expanding "voids" in there!) coating telescope optics. You know just as I do that even moderate vacuums like an A/C system are not defined by how much a pump can "suck" stuff, since that's not how vacuums work.
Yes, one could take a used receiver dryer, put in into a bell jar, pull a hard vacuum, then heat the whole thing to 150 degrees for a few hours, and you might recover the silica enough to be useful, but for the $20-50, WHY would you?