An astronaut can be seen in the open airlock of the International Space Station as he gets ready to close the hatch

Astronaut James Reilly goes back into the Quest airlock hatch after finishing a spacewalk. Image Credit: NASA

      an airtight room with two entrances that allows an astronaut to go on a spacewalk without letting the air out of the spacecraft

Astronauts get dressed for their spacewalks in an airlock on the space station.

Houses in cold places have an airlock so that cold air doesn't get into the house.

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