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 .
: Vital for space vehicles, allowing astronauts to exit for spacewalks while keeping the cabin pressurized. air lock
: Pharmaceutical facilities use them to prevent contamination by maintaining a pressure cascade between rooms. 2. Fluid Blockage (Plumbing & Irrigation) An air lock (or vapor lock) occurs when