hand-off cylinder A diving cylinder, complete with regulator, which can be handed off (manually transferred) to another diver in an emergency, so that the two divers are not obliged to remain in close proximity during the exit and ascent. Often visible as a blurred or shimmering region due to uneven refractive index. half timesĪ strong variation in salinity over a small depth range within a body of water. half maskĭiver's mask which covers the eyes and nose but not the mouth. Voice communications system where users take turns to send and receive. Primary cylinder gas (usually back gas) is retained for use in contingencies. ![]() The cylinder is breathed down to half of its starting pressure plus 200 psi (or 15 bar), so that a stage cylinder filled to 3000 psi would be breathed down to 1700 psi before being dropped. half+200 half+15Īn alternative scuba reserve gas management strategy to the rule of thirds for breathing stage cylinders. See: Decompression theory#Critical ratio hypothesisĭecompression models based on the principles described by John Scott Haldane. Subsection: Top, Ha, He, Hi, Ho, Hu Ha habitatĪn underwater structure inside which divers can carry out dry welding or which is fitted out with life support facilities. Glossary of underwater diving terminology: T–Z.Glossary of underwater diving terminology: P–S.Glossary of underwater diving terminology: H–O.Glossary of underwater diving terminology: D–G. ![]() Glossary of underwater diving terminology: A–C.The tables of content should link between them automatically: There are five sub-glossaries, listed here. A few are loan-words from other languages. There are instances where a term may have more than one meaning depending on context, and others where several terms refer to the same concept, or there are variations in spelling. Others are more specialised, variable by location, mode, or professional environment. Many of the terms are in general use by English speaking divers from many parts of the world, both amateur and professional, and using any of the modes of diving. ![]() Underwater diving is practiced as part of an occupation, or for recreation, where the practitioner submerges below the surface of the water or other liquid for a period which may range between seconds to the order of a day at a time, either exposed to the ambient pressure or isolated by a pressure resistant suit, to interact with the underwater environment for pleasure, competitive sport, or as a means to reach a work site for profit, as a public service, or in the pursuit of knowledge, and may use no equipment at all, or a wide range of equipment which may include breathing apparatus, environmental protective clothing, aids to vision, communication, propulsion, maneuverability, buoyancy and safety equipment, and tools for the task at hand. Underwater diving can be described as a human activity – intentional, purposive, conscious and subjectively meaningful sequence of actions. There may be other meanings in other contexts. The definitions listed are in the context of underwater diving. This is a glossary of technical terms, jargon, diver slang and acronyms used in underwater diving. Surface-supplied divers riding a stage to the underwater workplace ![]() Definitions of technical terms, jargon, diver slang and acronyms used in underwater diving
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