An airlock is a device which permits the passage of people and objects between a pressure vessel and its surroundings while minimizing the change of pressure in the vessel and loss of air from it. The lock consists of a small chamber with two airtight doors in series which do not open simultaneously. An airlock may be used for passage between environments of different gases rather than different pressures, to minimize or prevent the gases from mixing.
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airlock An airtight chamber, usually located between two regions of unequal pressure, in which air pressure can be regulated.
