Assertion: snorkel | /r/CapableOf | increase dead air volume
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text: A snorkel adds an additional dead space of 160-170 ml and causes an increase in the concentration of CO2 in the inspired gas due to expired air trapped in the snorkel which is then re-inspired As inidcated above, a snorkel increases the dead air volume that already exists in your trachea and mouth where no O2 exchange can occur.