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Calculation of the required weight and buoyancy volume to compensate for gas use can be done if the mass of the stored gas is known. Compensation for wetsuit buoyancy loss is a bit more complex and depends on the type and thickness of neoprene and surface area of the suit, and is best determined by experiment.
Divers wear diver weighting systems, weight belts or weights to counteract the buoyancy of other diving equipment, such as diving suits and aluminium diving cylinders, and buoyancy of the diver. The scuba diver must be weighted sufficiently to be slightly negatively buoyant at the end of the dive when most of the breathing gas has been used ...
The volume of the bag determines its lifting capacity: each litre of air inside the bag will lift a weight of 1 kilogram, or each cubic foot will lift about 62 pounds. For example, a 100-litre (3.5 cu ft) bag can lift a 100-kilogram (220 lb) underwater object.
In scuba diving, the ability to maintain neutral buoyancy through controlled breathing, accurate weighting, and management of the buoyancy compensator is an important skill. A scuba diver maintains neutral buoyancy by continuous correction, usually by controlled breathing, as neutral buoyancy is an unstable condition for a compressible object ...
The pressure vessel is a seamless cylinder normally made of cold-extruded aluminum or forged steel. [5] Filament wound composite cylinders are used in fire fighting breathing apparatus and oxygen first aid equipment because of their low weight, but are rarely used for diving, due to their high positive buoyancy.
The calculations assume that the dive profile, including decompression, is known, but the process may be iterative, involving changes to the dive profile as a consequence of the gas requirement calculation, or changes to the gas mixtures chosen. [11] [5] Scuba gas planning includes the following aspects: [11] [5] Choice of breathing gases