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This requires the diver to be negatively buoyant by the total mass of gas carried at the start of the dive with an empty buoyancy compensator, so the buoyancy compensator must have sufficient volume to neutralise this excess and any further loss of buoyancy in the diving suit during the descent. Calculation of the required weight and buoyancy ...
During the dive, buoyancy is controlled by adjusting the volume of air in the buoyancy compensation device (BCD) and, if worn, the dry suit, in order to achieve negative, neutral, or positive buoyancy as needed. The amount of weight required is determined by the maximum overall positive buoyancy of the fully equipped but unweighted diver ...
Buoyancy of equipment (mainly exposure suit). Buoyancy change of cylinders as gas is used up. Tasks of the dive. Capacity of buoyancy compensator to neutralise buoyancy at depth and provide positive buoyancy at the surface. Use surface supply equipment or a lifeline if it is necessary to dive heavy. Underweighting
Buoyancy compensator, which is adjustably positive, and compensates for the combined effect of the other equipment. In keeping with the minimalist philosophy, buoyancy compensators should be only as large as is necessary to provide neutral buoyancy at any point in the dive, and should allow easy, confident and reliable dumping.
When an incompressible buoyancy compensator is used, almost all of the variable volume is in the diving suit, and the depth range of effectively neutral buoyancy is maximised. A diver without a diving suit would be effectively neutrally buoyant over the full depth range of the dive, and only need to adjust buoyancy for mass loss as gas is used.
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. These effects are mostly ...