neutral buoyancy device
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Buoyancy compensator (diving) — Stab jacket redirects here. For a type of body armor, see stab vest. A buoyancy compensator (or buoyancy control device, BC or BCD) is a piece of diving equipment worn by divers to provide: * life saving emergency buoyancy both underwater and on… … Wikipedia
Personal flotation device — A man wearing a life vest, with another life vest hanging at the lower left. A personal flotation device (abbreviated as PFD; also referred to as, lifejacket, life preserver, Mae West, life vest, life saver, cork jacket, buoyancy aid, flotation… … Wikipedia
Dry suit — A dry suit or drysuit provides thermal insulation or passive thermal protection to the wearer while immersed in water,[1][2][3][4] and is worn by divers, boaters, water sports enthusiasts, and others who work or play in or near cold water. A dry… … Wikipedia
Scuba diving — Not to be confused with Self contained breathing apparatus, which describes breathing sets used out of water. Scuba diver Scuba diving ( SCUBA originally being an acronym for self contained underwater breathing apparatus, now widely considered a… … Wikipedia
Mass versus weight — The chains on the swing hold all the child’s weight. If one were to stand behind her at the bottom of the arc and try to stop her, one would be acting against her inertia, which arises purely from mass, not weight. In everyday usage, the mass of… … Wikipedia
Demersal fish — Bluespotted ribbontail ray resting on the seafloor Demersal fish live on or near the bottom of the sea or lakes.[1] They occupy the sea floors and lake beds, which usually consist of mud, sand, gravel or rocks … Wikipedia
Diving physics — explains the effects that divers and their equipment are subject to underwater. Contents 1 Laws of physics for diving 2 Physical effects of water for divers 3 Physical phenomena of interest to divers … Wikipedia
Hot air balloon — This article is about hot air balloons themselves. For the associated activity, see hot air ballooning. For the rock opera, see Hot Air Balloon (rock opera). For the song, see Hot Air Balloon (song). Hot air balloon in flight … Wikipedia
Caisson lock — A caisson lock is a type of canal lock in which a narrowboat is enclosed in a sealed box and raised or lowered between two water levels.HistoryIt was first demonstrated at Oakengates on the now lost Shropshire Canal in 1792, where its inventor,… … Wikipedia
Timeline of diving technology — This is a timeline of underwater technology. The entries marked ## are about decompression tables.[1] Contents 1 Pre industrial 2 19th century 2.1 Rebreathers appear … Wikipedia
