Scuba Gear

Buoyancy Compensators

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A buoyancy compensator (BC) or buoyancy compensating device (BCD) is a jacket that helps divers maintain neutral buoyancy during a dive.

When an object underwater rises, it's positively buoyant. If it sinks, it's negatively buoyant.

When it remains stationary, divers say it has achieved 'neutral buoyancy' - the goal for all divers.

A buoyancy compensator works by filling bladders in the device with air. Since air is less dense than water, it's positively buoyant. The attached jacket forces the diver up. All other things being equal the more air, the more upward force.

By inflating or deflating the buoyancy compensator, the diver can control how much or how little buoyant force it provides. Working alongside (or with some designs, inside) the buoyancy compensator are weights that counteract the buoyancy.

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How To Choose a Buoyancy Compensator - By Leisurepro

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Buoyancy compensator (diving)

High Quality Content by WIKIPEDIA articles! A buoyancy compensator (or buoyancy control device, BC or BCD) is a piece of diving equipment worn by divers to provide: life saving emergency buoyancy both underwater and on the surface.The ability to adjust and control the overall buoyancy of the diver and the diver's heavy equipment allowing the diver to achieve neutral buoyancy, remaining at constant depth, or to descend or ascend in a controlled way. Some types of buoyancy compensator also built around the diver's scuba set or are built into its harness. BCs can have the following features: A low pressure direct feed that transports gas from diving cylinder and diving regulator to the BC. An inflation valve that allows gas from the direct feed into the bladders of the BC. A vent valve that allows gas to escape from the bladders of the BC. Most BCs have at least two vents: one at the extreme top and the other at the bottom of the BC.

LZ 127 Graf Zeppelin: Airship, Ferdinand von Zeppelin, Graf, Hugo Eckener, Maybach, Buoyancy compensator (aviation), LZ 130 Graf Zeppelin, List of Zeppelins

LZ 127 Graf Zeppelin was a large German passenger carrying rigid airship which operated commercially from 1928 to 1937. It was named after the German pioneer of airships, Ferdinand von Zeppelin, who held the rank of Graf or Count in the German nobility. During its operating life the great airship made 590 flights covering more than a million miles.


Diving cylinder: Pressure, Breathing gas, Scuba diving, Diving regulator, Compression, Diving air compressor, Surface Marker Buoy, Dry suit, Buoyancy compensator (diving), Gas cylinder, Oxygen therapy

A diving cylinder, scuba tank or diving tank is used to store and transport high pressure breathing gas as a component of SCUBA (Self-Contained Underwater Breathing Apparatus). It provides gas to the SCUBA diver through the demand valve of a diving regulator. Diving cylinders typically have an internal volume of between 3 and 18 litres (0.11 and 0.64 cu ft) and a maximum pressure rating from 200 to 300 bars (2,900 to 4,400 psi). The internal cylinder volume is also expressed as "water capacity" - the volume of water which could be contained by the cylinder. When pressurised, a cylinder carries a volume of gas greater than its water capacity because gas is compressible. 600 litres (21 cu ft) of gas at atmospheric pressure is compressed into a 3-litre cylinder when it is filled to 200 bar. Cylinders also come in smaller sizes, such as 0.2, 1.5 and 2 litres, however these are not generally used for breathing, instead being used for purposes such as Surface Marker Buoy, drysuit and buoyancy compensator inflation.

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