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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 ...
A lead weight of 1 kg would be replaced by an iron weight of 1 × (7.87/11.34) × ((11.34-1)/(7.87-1)) = 1.044 kg, a 4.4% additional load for the diver when out of the water. Iron is also corroded much more easily in seawater than lead, and would need some form of protection to prevent rusting.
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.
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 ...
Buoyancy problems due to weight of tools—Inability to achieve neutral buoyancy for ascent and positive buoyancy on surface. Increased risk of drowning. difficulty in controlling ascent rate. Risk of losing tools if they must be abandoned. Carrying an excessive weight of tools. Tools may be lifted and lowered to the worksite using a rope. [68]
Highly visible line helps reduce the risk of losing the line in bad visibility, and a near neutral buoyancy of the reel minimises the fatigue caused by carrying it in the hand for long periods. Matching the size of a reel or spool to its intended use allows easy recognition by feel and efficient storage. [110] [111]
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 ...
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