Glossary of underwater diving terminology
This is a glossary of technical terms, jargon, diver slang and acronyms used in underwater diving. The definitions listed are in the context of underwater diving. There may be other meanings in other contexts.
see adjustable buoyancy life jacket
Total static pressure at the reference point: Pressure relative to vacuum.
see yoke adaptor
see also Rebreather#Active addition semi-closed circuit
System for semi-closed circuit rebreather feed gas addition in which gas is added to the breathing circuit by a mechanism, regardless of current volume, and excess gas is vented to keep the loop volume within limits. Compare with passive addition
A filter medium used to remove oil, water and odours from breathing air.
Also known as ABLJ or horse collar buoyancy compensator
A combination of buoyancy compensator and inflatable life jacket worn on the chest and round the neck.
Part of Launch and Recovery System
Gantry or davit for launching and recovering bells, stages anchors or large ROVs. Usually deployed by hydraulic rams which swing the frame over the deck or overboard as required. The load is hoisted and lowered by cables from the top of the frame.
A device based on a pipe, used in by divers to suck small objects, sand and mud from the sea bed and to transport the resulting debris upwards and away from its source. Air is injected into the lower end of the pipe and the rising bubbles entrain water and cause an upward flow which draws the material from the bottom along.
A rapid increase or accumulation in the population of algae (typically microscopic) in an aquatic system. Some blooms may be recognized by discoloration of the water resulting from the high density of pigmented cells. Visibility can be severely impaired over a period of hours to days.
A secondary supply of air or other breathing gas used by the diver in an emergency
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