What is Scuba?

Scuba (Self-Contained Underwater Breathing Apparatus) is an apparatus utilizing a portable supply of compressed gas supplied at a regulated pressure and used for breathing while swimming underwater. The apparatus is often called "scuba gear", a "scuba system" or simply "scuba". Scuba is also the common name for the sport (also called "diving" or "scuba diving") which uses the apparatus for recreational diving.

Like other acronyms (such as radar) scuba has become such an ubiquitous term for underwater breathing equipment and the recreational sport of deep diving that it is usually written without capitals. Even though it is an acronym it has entered common usage in the English language and may be used as a noun or adjective.

There are two kinds of scuba equipment:
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