[Milsurplus] DIY Vacuum Chamber

[Facility 406]

> I'm not sure minus 10000 psi has a meaning. Can you make a vacuum that's 
> a harder vacuum than a perfect vacuum?

Draw harder.  Drawing -15 just means hitting neutral to what we are 
familiar with.

Have one unit of space, pull 300 times that, see what happens, not 
pulling against the ambient pressure we happen to be within, to relative 
nothing, but what the equipment can actually do, independent of the 
atmosphere.  We can compress gas to tens of thousands of PSI, why not 
draw as much?

Yes, PSI, is that a thing when it hits zero?  What is PSI when it's less 
than zero.  I'd go with negative, as it's relative, and whether pushing 
a pound, or pulling a pound, it' still a pound, so PSI seems to apply, 
whether it's plus, or minus a pound.

I really don't know, honestly, but I've had problems, so minus a lot, 
may be a thing.

Kurt