: Pharmaceutical facilities use them to prevent contamination by maintaining a pressure cascade between rooms. 2. Fluid Blockage (Plumbing & Irrigation)
: Historically used in underwater tunnels and bridge foundations (caissons) to transition workers from atmospheric pressure to high-pressure work zones. air lock
: Vital for space vehicles, allowing astronauts to exit for spacewalks while keeping the cabin pressurized. Pa. Courtesy of Elgood-Mayo Corp.
Related resources for this article ... Courtesy of Elgood-Mayo Corp., Lancaster, Pa. Courtesy of Elgood-Mayo Corp., Lancaster, Pa. Britannica Kids Pa. Britannica Kids