[Milsurplus] DIY Vacuum Chamber

[Bob kb8tq]

Hi

Any time you play with pressure in ATM … yes it changes as you change planets. So the math is going to change as you do that. 

Still regardless of the planet, 0 psi is still 0 psi. 

Bob

> On Sep 24, 2026, at 7:39 PM, Facility 406 via Milsurplus <milsurplus at mailman.qth.net> wrote:
> 
>> Start with 10 tennis balls in a bucket, take them all out. Ask: "What happens if I take out another ten?”. Answer: You can’t there aren’t any more in there. You just keep reaching into the bucket and coming up empty handed. Nothing happens when you do.
> 
> 
> Interesting, to say the least.
> 
> How about these ideas that came to mind?
> 
> We live in relative +15psi.  Pumping to 0 is -15psi.
> 
> OK...
> 
> Venus is +1350psi.  What happens when we hit 0 there?  -1350psi?  Still a chamber, still a pump, still 0.
> 
> Relative to the ambient pressure on Venus, it would be -1 atmosphere. Relative to what we're familiar with locally, it would be minus 90 times more.
> 
> One could say that only one atmosphere is pressing on the outside, +15 on earth, +1350 on Venus, but, the sealed chamber isn't only interacting with the atmosphere pushing from the outside, it's also the inside being draw out, with incredible force, which could be tens, hundreds, or thousands times more.  That atmosphere, whatever it may be, just happens to surround the chamber.
> 
> All that is just assuming 1:1 from inside, to outside.  What if we just forget psi, here, there, or elsewhere, and just pump from +1 to -1 atmosphere, wherever?  Yeah, on Venus, we'd pump more, of a higher destiny atmosphere, just to hit zero, but that zero is nearly -1/2 ton by our measurements.
> 
> We can be sure I'll play with this, and see what happens, I just can't say, or even guess, when.  I have a lot of the bits, maybe even all, just not set up to play.
> 
> Kurt
> 
> 
> 
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