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Can pressure be zero?

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Dec 24, 2016

Not unless literally nothing is in the system.

Apparently, #10^(-12)# #"torr"# has been accomplished (ultra-high vacuum), while interstellar space has around #"1 atom/cm"^3#, but it's certainly not easy for humans to accomplish.

The most straightforward article I could find mentions CERN readily managing #10^(-13) "atm"# of pressure after two weeks of pumping, which is around #7.6xx10^(-11)# #"torr"#. That's pretty good...

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