Air Lock

n. airtight chamber, small area between two airtight doors which allows one to pass through to an area with a different atmospheric pressure; pocket of air or vapor in a pipe that prevents the regular flow of fluids

For a device that prevents air or heat escaping from an enclosed chamber, see: AirlockAn air lock is gas trapped in a high point of a liquid-filled pipe system. The gas, being lighter than the liquid, rises to the highest point and restricts the flow of liquid. In very tall systems, the gas can prevent flow entirely.Flushing the system with high flow or pressures can help move the gas away from the highest point, or a tap can be installed to permit the gas to be vented.
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Noun
1. a chamber that provides access to space where air is under pressure
(synonym) airlock
(hypernym) chamber

Synonyms and related words:
aboideau, access, adit, approach, corridor, dock gate, entrance, entranceway, entry, entryway, flood-hatch, floodgate, gangplank, gangway, gate, hall, head gate, in, ingress, inlet, intake, lock, lock gate, means of access, opening, passage, passageway, penstock, sluice, sluice gate, tide gate, vestibule, water gate, way, way in, weir,
  

air-lock /'eəlɔk/
danh từ (kỹ thuật) nút không khí
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