aqualung

Also called a scuba (self-contained underwater breathing apparatus), a device that allows divers to breathe and move about freely underwater for extended periods. It consists of a mouthpiece, a connecting tube, a valve, and at least one compressed-air cylinder. The key component is the "demand valve" which allows the diver to breathe air at the pressure prevailing in the surrounding water however great the pressure in the supply cylinder. Used air is vented into the water.

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• TECHNOLOGY

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