An **air lock** is a controlled environment that prevents air or contaminants from entering or exiting a specific area. It is commonly used in various settings, including: 1. **Spacecraft:** Air locks are utilized in space vehicles to facilitate the transfer of astronauts and equipment between the pressurized environment of the spacecraft and the vacuum of space. An astronaut would enter the airlock, depressurize the chamber, and then open the outer door to exit into space.
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