4 ms·

The minimum pressure of a perfect vacuum is 0 atm, not -1 atm as you say [0]. [0] https://en.m.wikipedia.org/wiki/Vacuum#Measurement https://en.m.wikipedia.org

• URSpider94 9y ago
  Sure, but it's -1 atm gradient, which is how we commonly measure pressure. I.e., when you fill your car tires to 32 psi, that's 32 psi over atmospheric. When you're talking about pressure, it's the gradient that matters.
  • washadjeffmad 9y ago
    It was taught as psia, -g, & -d (or absolute, gauge, and differential) when I was in school, so I read your -1 atm as psid. Your car example would be 32 psi gauge assuming STP, or ~36 psi absolute. The miners are below the surface and not at 1 atm, so any gauge measures taken there would be psid.