Vacuum

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 is a device that can 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. 

In 2364, Captain Picard ordered that the medical lab on board the USS Enterprise (NCC-1701-D) be turned into a vacuum to contain the microbrain lifeform that was located there. 

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. 

Lt. Commander Data was able to function for extended periods of time in a vacuum. 

At least some Borg drones were capable of functioning in a vacuum.