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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.
Constant weight bi-fins, denoted by the acronym CWTB in competition notation, is a competitive freediving discipline wherein the freediver wears a pair of bi-fins (or stereo, as opposed to a monofin) to descend along the line with or without the use of their arms. Pulling on the rope or changing ballast will result in disqualification; only a ...
Example 1c: The same diver, but 2 kg overweighted, decompressing at 3 m with 50 bar reserve in a 12 litre cylinder will need about an additional 2 litres of gas in the BC for neutral buoyancy. The same depth change of 1 m upwards will increase the gas volume in the BC to 1.3/1.2 × 2.78 = 3.012 litres, a difference of 0.232 litres.
Free divers may also use weights to counteract buoyancy of a wetsuit. However, they are more likely to weight for neutral buoyancy at a specific depth, and their weighting must take into account not only the compression of the suit with depth, but also the compression of the air in their lungs, and the consequent loss of buoyancy.
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 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. The mass will depend on the specific formulation of the foam ...
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 ...
Diving physics, or the physics of underwater diving, is the basic aspects of physics which describe the effects of the underwater environment on the underwater diver and their equipment, and the effects of blending, compressing, and storing breathing gas mixtures, and supplying them for use at ambient pressure.
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