![]() ![]() Although one end of the snorkel is open to the air, when the wearer breathes in, they inhale a significant quantity of air that remained in the snorkel from the previous exhalation. ĭead space can be increased (and better envisioned) by breathing through a long tube, such as a snorkel. In adults, it is usually in the range of 150 mL. In humans, about a third of every resting breath has no change in O 2 and CO 2 levels.
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