for handling air-sensitive substances. Two airlocks (a small and a large one) are attached to the right to take samples in and out without disturbing the inert atmosphere inside]]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 also be used for passage between environments of different gases rather than different pressures, to minimise or prevent the gases from mixing. An airlock may also be used underwater to allow passage between an air environment in a pressure vessel and a water environment outside, in which case the airlock can contain air or water. This is called a floodable airlock or an underwater airlock, and is used to prevent water under h

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