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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 ...
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.
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.
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 ...
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 ...
Increased buoyancy of the BCD and dive suit due to gas expansion could cause a runaway ascent so air is vented as the divers ascend to retain approximately neutral buoyancy. At the end of the dive the BC should contain only a small amount of gas to support the unused gas in the cylinders.
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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