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Dive Adventures Scuba Glossary is for scuba divers and anyone else interested in scuba diving terminology. To find the scuba glossary term that you are looking for click on the letters below to display the scuba glossary terms that begin with that letter. If you feel that we have missed a term from our scuba glossary or would like a term added to our scuba glossary please contact us so that we can add that term to our scuba glossary. Dive Adventures thanks you for visiting our scuba glossary and helping us to make it better for other scuba divers and those interested in scuba diving terminology Optionally you may select "All Terms" to display the entire list of terms from our scuba glossary database.
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D
D.A.N.
Divers Alert Network. Nonprofit organization that provides emergency and informational advice and assistance for diving injuries, promotes diving-related medical research and education, collects injury statistics, and offers dive safety services to its members and the diving community.
Dalton's Law
The total pressure exerted by a mixture of gases is equal to the sum of the pressures of each gas of the different gases making up the mixture. Each gas acting as if it were alone were present and occupied the total volume.
Deco Mix
Gas mixture used during decompression.
Decompression
Any change from one ambient pressure to a lower ambient pressure, always results in a reduction of gas pressure within the body.
Decompression dive
Any dive where the diver is exposed to a higher pressure than when the dive began, the decompression occurs as the diver ascends.
Decompression illness
DCI; a term to encompass all bubble-related problems arising from decompression, including both decompression sickness and arterial gas embolism.
Decompression sickness
DCS; a general term for all problems resulting from nitrogen leaving the body when ambient pressure is lowered. Can be divided into Type I (musculoskeletal and/or skin manifestations only) or the more serous Type II (neurologic, cardiac, and/or pulmonary manifestations).
Decompression stop
On ascent from a dive, a specified time spent at a specific depth, for the purpose of nitrogen off-gassing. When not mandatory it is called a safety stop.
Deep diving
For recreational divers a deep dive is a dive below 60 ft.
DEMA
Dive Equipment & Marketing Association. Not-for-profit organization of equipment manufacturers, training agencies, dive media, travel companies and dive retailers that seeks to promote scuba diving and snorkeling to the general public.
Depth gauge
A device that indicates how far a diver is below the surface.
Descent/Ascent Line
A line suspended from a boat, float or buoy used to permit divers to control their descents and ascents and to provide guidance to the bottom in poor visibility or strong currents; particularly useful on ascent to assist divers to make safety or emergency decompression stops between 10 and 15 feet.
Diaphragm
A dividing membrane or thin partition; the thin muscle separating the chest cavity from the abdominal cavity; the rubber (or other material) separating the demand chamber in a regulator from the surrounding water.
DIN
Deutsches Institut fur Normung. Design of tank valve popular in Europe in which the first-stage regulator screws into the tank valve. Recommended for high pressure tanks.
Dive computer
Device that constantly measures depth and time, based on a pre-programmed algorithm, the computer calculates tissue nitrogen uptake and elimination in several theoretical compartments and provides a continuous readout of the dive profile, including: depth, elapsed time of the dive, duration at current depth before decompression becomes mandatory, and a warning if the rate of ascent is too fast.
Dive Flag
May be either a red rectangle with a white diagonal stripe or a blue and white double tailed pennant. Flags are used to warn watercraft to stay away because there are divers below.
Dive lights
Specially designed underwater lights used for night, cave or wreck diving.
Dive Master
A professional level diver who leads a group of less experienced divers underwater. He works with an Instructor during classes.
Dive Profile
a two dimensional representation of the two most important characteristics of the dive that a diver must monitor to dive safely: depth and time. The profile is often used when describing a dive's likely decompression obligation.
Dive Shop
A supplier of diving equipment or training, or organizer of dive expeditions.
Dive Tables
A printed collection of dive times for specific depths, by which the divers can avoid contacting DCS. Most tables are based on Haldanian theory for nitrogen up-take and elimination.
Diver propulsion vehicle
Motorized vehicle used by divers to cove long distances underwater without having to kick.
DOT
Department of Transportation. U.S. government agency that regulates the manufacture, testing and transport of compressed gas containers, including scuba cylinders. DOT stamp appears on scuba tanks, followed by the alphabetic designation for the steel or aluminum alloy the tank is made of and the maximum fill pressure.
DPV
Diver propulsion vehicle, underwater scooter that allows a dive to cover an increased distance underwater. Popular at some resorts.
Drop Weight
Weight used during descent and ascent, but left on the bottom at the guideline during the deep part of the dive when it is not needed due to suit compression.
Drowning
A death caused by inability to inhale anything but water. The process of experiencing respiratory impairment from submersion/immersion in liquid.
Dry Suit
A water-tight garment that keeps the diver's body warm by providing insulation with a layer of gas, such as air, for diving in waters that are too cold for comfortable wetsuit protection, usually below 65'F.
Dysbarism
A medical conditions resulting from changes in ambient pressure.

There are 28 scuba glossary terms listed.

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Modified 12/04/2014