open-circuit scuba

open-circuit scuba

[′ō·pən ¦sər·kət ′skü·bə]
(engineering)
The simplest type of scuba equipment, in which all exhaled gas is discharged directly into the water and the utilization of gas is therefore equal to the mass exhaled.
References in periodicals archive ?
The bubbles emitted by an open-circuit scuba (self-contained underwater breathing apparatus) are oxygen and other gases that are exhaled.