Counterlung

Counterlung is a component of rebreather diving equipment that serves to manage the volume of breathing gas. It is a flexible container that expands and contracts as the diver breathes in and out, respectively. The counterlung is typically located close to the diver's lungs to minimize the work of breathing.

Function

The primary function of the counterlung is to hold the exhaled gas until it can be scrubbed of carbon dioxide and replenished with oxygen. This process allows the rebreather to recycle the majority of the gas, making it more efficient than open-circuit scuba equipment. The counterlung also serves to balance the pressure of the breathing gas with the ambient pressure, which changes with depth.

Types

There are two main types of counterlungs: over-the-shoulder and chest-mounted. Over-the-shoulder counterlungs are located above the diver's lungs, while chest-mounted counterlungs are located in front of the diver's lungs. The type of counterlung used can affect the work of breathing, with chest-mounted counterlungs generally providing less resistance.

Considerations

The size and position of the counterlung can affect the diver's buoyancy and trim. A larger counterlung can provide more buoyancy but may also be more cumbersome. The position of the counterlung can affect the diver's center of gravity and balance.

See also

• Scuba diving
• Diving equipment
• Rebreather diving

Counterlung Resources
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