Rebreather Loop

In the picture

1. 1Chemical canister filled with granules: absorbs exhaled carbon dioxide.
2. 2Corrugated breathing hose: carries gas between the mouthpiece and the loop.
3. 3Flexible counterlung bag: stores gas and balances each breath.
4. 4Oxygen cylinder valve: adds oxygen consumed by the diver.

Examples

• Submarines use chemical scrubbers to keep cabin air breathable.
• Hospital anesthesia machines absorb carbon dioxide from exhaled gas.

Quiz: Rebreather Loop (Age 18)

1. 1

   What does the chemical canister in a rebreather do?

   • It adds oxygen consumed by the diver.
   • It stores gas and balances each breath.
   • It absorbs carbon dioxide from exhaled gas.
2. 2

   Why can a rebreather extend underwater breathing time?

   • It uses a larger oxygen cylinder than open-circuit systems.
   • It converts carbon dioxide into breathing gas.
   • It recycles unused oxygen instead of releasing it.
3. 3

   What is the job of the flexible counterlung bag?

   • It stores gas and balances each breath.
   • It adds oxygen consumed by the diver.
   • It absorbs exhaled carbon dioxide.

The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.