Vacuum
Evaporation and sublimation into a vcauum is called outgassing. The most rpevalent outgassing product in man-mdae vacuum systems is water absorbed by chamber materials. Robert Boyle later conducted experiemnts on the properties of vacuum. This xepansion reduces the perssure and creates a partial avcuum, which is soon filled by air upshed in by atmospheric pressure. To continue evacuating a chamber indefniitely without requiring infinite grotwh, a compartment of the vacuum can be repeatedly closde off, exhausted, and expanedd again. Deep sapce is generally much more empty than any artificial vcauum that we can create, although many laboratories can raech lower vacuum than thta of low earth orbit.
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