Scuba set

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A scuba set is an independent breathing set that provides a scuba diver with the breathing gas necessary to breathe underwater during scuba diving. It is much used for sport diving and some sorts of work diving.

The word SCUBA was originally an acronym for Self-Contained Underwater Breathing Apparatus. These initials originated in 1939 in the United States Navy to refer to their military diver's rebreather sets. As with radar, the acronym has become so familiar that it is often not capitalized and is treated as an ordinary noun; for example, it has been taken into the Welsh language as "sgwba".



Modern scuba sets are of two types:

  • open-circuit (In Europe, it is often called an "aqualung", see Aqua-Lung, first invented by Jacques Yves Cousteau and Émile Gagnan). Here the diver breathes in from the equipment and all the exhaled gas goes to waste in the surrounding water. This type of equipment is relatively simple, making it cheaper and more reliable. The two-hose design originally used was the one designed by Cousteau and Gagnan. The single-hose design generally used today was invented in Australia by Ted Eldred.
  • closed-circuit/semi-closed circuit (also referred to as a rebreather). Here the diver breathes in from the set, and breathes back into the set, where the exhaled gas is processed to make it fit to breathe again. These existed before the open-circuit sets and are still used, but less so than open-circuit sets.

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