A vacuum is a volume of space that is essentially empty of matter, such that its gaseous pressure is much less than atmospheric pressure.

A vacuum chamber was a device that could create a vacuum inside of an enclosed container. Doctor Mora Pol subjected Odo to a vacuum chamber during his early experiments on the Changeling during the Occupation of Bajor. (DS9: "The Begotten")

In 2364, Captain Picard ordered that the medical lab on board the USS Enterprise-D be turned into a vacuum to contain the microbrain lifeform that was located there. (TNG: "Home Soil")

In 2370, with the discovery of a piece of wreckage from the USS Pegasus (lost twelve years previously), Commander Riker noted that the vacuum of space had preserved everything, including the dead bodies of the crew. (TNG: "The Pegasus")

Lt. Commander Data was able to function for extended periods of time in a vacuum. (TNG: "Birthright, Part I")

At least some Borg drones were capable of functioning in a vacuum. (Star Trek: First Contact)

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