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The harness holds the regulator and the air line in place, allowing the diver to swim unencumbered beneath the surface. [1] Full scuba gear, which includes a buoyancy compensator, weights, and cylinder, can weigh in excess of 27 kilograms (60 lb), [10] but this is not strictly comparable, as it would usually include a wetsuit for thermal ...
Surface-supplied divers may be more heavily weighted to facilitate underwater work, and may be unable to achieve neutral buoyancy, and rely on the diving stage, bell, umbilical, lifeline, shotline or jackstay for returning to the surface. Free divers may also use weights to counteract buoyancy of a wetsuit.
The total buoyancy loss of a wetsuit is proportional to the initial uncompressed volume. An average person has a surface area of about 2 m 2 , [ 14 ] so the uncompressed volume of a full one piece 6 mm thick wetsuit will be in the order of 1.75 x 0.006 = 0.0105 m 3 , or roughly 10 liters.
A line guide is almost always present to prevent line from unwinding unintentionally, and there is usually a method of clipping the reel to the diver's harness when not in use. Reels may be made from a wide variety of materials, but near neutral buoyancy and resistance to impact damage are desirable features. Reels may also be open or closed.
Scuba divers with good trim and neutral buoyancy. The trim of a diver is the orientation of the body in the water, determined by posture and the distribution of weight and volume along the body and equipment, as well as by any other forces acting on the diver. Both static trim and its stability affect the convenience and safety of the diver ...
Neutral buoyancy occurs when an object's average density is equal to the density of the fluid in which it is immersed, resulting in the buoyant force balancing the force of gravity that would otherwise cause the object to sink (if the body's density is greater than the density of the fluid in which it is immersed) or rise (if it is less). An ...
The buoyancy compensator is used by ambient pressure divers using underwater breathing apparatus to adjust buoyancy underwater or at the surface within the range of slightly negative to slightly positive, to allow neutral buoyancy to be maintained throughout the depth range of the planned dive, and to compensate for changes in weight due to breathing gas consumption during the dive.
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 ...
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