Air | Lock
An air lock (or vapor lock) occurs when gas becomes trapped in a high point of a liquid-filled pipe system, partially or completely blocking the flow .
Related resources for this article ... Courtesy of Elgood-Mayo Corp., Lancaster, Pa. Courtesy of Elgood-Mayo Corp., Lancaster, Pa. Britannica Kids air lock
In engineering, an air lock is a chamber that allows people or objects to pass between areas of different air pressures without significantly changing the pressure of either environment. An air lock (or vapor lock) occurs when
: Historically used in underwater tunnels and bridge foundations (caissons) to transition workers from atmospheric pressure to high-pressure work zones. Pa. Courtesy of Elgood-Mayo Corp.