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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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Backpack
A rigid or semi-rigid structure similar in function to a backplate, usually made of moulded plastic, but sometimes of metal, used either as a stiffener and reinforcement for a jacket style buoyancy compensator, or as the basis of a scuba harness independent of a buoyancy compensator. The backpack supports and stabilises the scuba cylinder on the diver's back.
Backplate
A plate, normally made from metal, which rests against the diver’s back, and to which the primary scuba cylinders are attached. Held to the body by harness straps over the shoulders and round the waist. Sometimes also crotch straps and chest straps. Usually used with a back inflation buoyancy compensator.
Backscatter
When suspended particles in the water, such as sand, are illuminated by light from a flash, they reflect the light back to the lens. The particles appear as specks or snow in the photo.
Backward kick
A finning technique for moving backwards. Not an easy, powerful or elegant kick, but useful in many situations. The fins are angled outwards in opposite drections with the legs straight, then swept upwards and towards the diver by bending the knees in the power stroke. The knees may move downwards a bit at the same time by bending at the hips for stability. The return stroke feathers the fins by pointing them backwards in line with the body axis, to reduce forward thrust until the legs are straight again.
Backward Roll Entry
means of entering the water in SCUBA gear from a sitting position such as from the gunnel of a boat whereby the diver, while securely holding his mask, leans backward and rolls into the water onto his tank and shoulders. Checking for an all clear is recommended.
Bailout
training technique used in some SCUBA classes wherein the student jumps into the pool while holding all equipment in hand and then dons the equipment on the bottom of the pool; or, pertaining to or consisting of a means for relieving an emergency situation.
Bailout cylinder
A scuba cylinder carried by an underwater diver for use as an emergency supply of breathing gas in the event of a primary gas supply failure.
Bailout valve
1. An open circuit demand valve built into a rebreather mouthpiece, or other part of the breathing loop, which can be isolated while the diver is using the rebreather to recycle breathing gas, and opened at the same time as isolating the breathing loop when the diver bails out to open circuit. 2. A valve which opens the gas supply from the bailout cylinder of a surface supplied diver, used in case of surface gas failure, usually mounted on the side of a diving helmet or full-face mask, or on a manifold block on the diver's harness.
Balanced regulator
Regulator designed to provide a consistent demand effort not affected by cylinder gas pressure or depth.
Barometric pressure
Same as atmospheric pressure with the exception that it varies with the weather.
Barotraumas
Any disease or injury due to unequal pressures between a space inside the body and the ambient pressure, or between two spaces within the body; examples include arterial gas embolism and pneumothorax.
BAT wing
Buoyancy And Trim wing. A back mounted buoyancy compensator cell used with sidemount harness. The buoyancy volume is mostly over the lower back.
BC or BCD
See buoyancy compensator.
Beach Master or Beach Marshal
A person on the beach who records when divers enter and exit the water. Typically used during scuba classes to keep track of the students, watch the gear, provide assistance when required.
Bell harness
A safety harness made of strong webbing, which is fastened around a diver over the exposure suit, and allows the diver to be lifted without risk of falling out of the harness.
Bell man
Standby diver in the diving bell.
Bell run
The part of a bell dive operation from bell lock-off to bell lock-on (to and from the life support system).
Bell umbilical
The combined supply and return hoses and cables for life-support, power and communications between a diving bell and the support platform.
Bends
A form of decompression sickness caused by dissolved nitrogen leaving the tissues too quickly on ascent; is manifestation of decompression sickness.
Bent D-ring
A D-ring which has been bent about 45° near the straight section on both sides, forcing it to project slightly from the harness when pushed to one side, allowing easier attachment of clips.
Bladder
A pouch within a Buoyancy Compensator which holds the amount of air the diver desires to provide proper buoyancy.
Body suit
Garment that provides full length abrasion protection.
Bootie
A piece of foot protection, usually made of neoprene, worn inside an open-heeled fin; serves to protect the diver's feet while walking to and from the dive site and prevents blisters from the fins while swimming; also provides warmth, depending on thickness. May come in a varying sole thickness.
Bottom time
The time between descending below the surface to the beginning of ascent.
Bow
The front end of a boat.
Boyle's law
At a fixed temperature for a fixed mass of gas, pressure times volume is a constant value.
Breath-hold diving
Diving without life support apparatus, while holding one's breath.
BTU
Britsh Thermal Units or calories; measurment of heat.
Bubble
A collection of air or gas surrounded by a permeable membrane through which gases can enter or exit.
Buddy
Diving partner.
Buddy Breathing
Sharing of the same air supply by two or more divers; an emergency technique used when one person's air supply is exhausted or unavailable due to equipment malfunction.
Buddy System
Pair or sometimes threesome of divers that dive together as a team for safety.
Buoyancy
The upward force exerted on an object in liquid, whether the object sinks or floats. Objects that float are positively buoyant, those that sink are negatively buoyant and those that stay where placed are neutrally buoyant.
Buoyancy compensator
An inflatable vest worn by the diver that can be automatically or orally inflated to help control buoyancy; abbreviated BC or BCD (Buoyancy Control Device).
Burst disk
Thin copper disk held in place with a vented plug. Designed to rupture if tank pressure is greatly exceeded.

There are 35 scuba glossary terms listed.

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Modified 12/04/2014