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If a rebreather adds Oxygen, how come there are no bubbles?

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If a rebreather adds Oxygen, how come there are no bubbles?

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When the diver breathes the air in the closed loop, the Oxygen is actually absorbed by his body, and the exhaled CO2 is absorbed by the Scrubber material. This lowers the total volume of gas in the closed loop, so when Oxygen is added, it merely replaces the gas volume lost to both these systems (the human, and chemical system).

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