Open circuit scuba diving - Kaiho Kairoshiki Scuba

...the name is an acronym for self-contained underwater breathing apparatus, and refers to a diving apparatus in which the diver carries his or her own breathing medium and system and can swim freely underwater without assistance from the surface. The most common type is the open-circuit scuba, which releases air once it has been used, and is equipped with a tank containing pressurized air and a regulator (a pressure regulator that reduces the pressurized air to the same level as the water pressure in the diver's environment)....

*Some of the terminology that refers to "open circuit scuba diving" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…名称はself‐contained underwater breathing apparatus(自給気式潜水器)の頭文字にちなみ，ダイバーがみずから呼吸媒体とそのシステムを背負い，海上からの支援なしに自由に海中を泳ぐことができる潜水器をいう。最も一般的なものは一度使用した空気を放出する開放回路式スキューバで，高圧空気の入ったタンク，レギュレーター(圧力調整器。高圧空気をちょうどダイバーのいる環境水圧と同じまでに下げる調整器。…

※「開放回路式スキューバ」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報