[Blood of Tyrants]

What is double vacuum? I thought a vacuum was the absence of any air.

[Artemis Webb]

From what I can gather it’s a misleading term. What is being postulated online is that the standard internal pressure of the suit was doubled while in vacuum to test against bursting.

[rjsimmon]

What is double vacuum? I thought a vacuum was the absence of any air.

It's like double-secret probation, without the guilt.

[jmcenanly]

Probably twice standard atmospheric pressure or 29.7 psi inside against a vacuum outside, or three times standard atmospheric pressure or 44.1 psi inside to standard atmospheric pressure outside. Consider that the pressure in most automobile tires is about 32 psi.