Gas leaving an unheated humidifier at 10° C and 100% relative humidity (absolute humidity = 9.4 mg/L) would provide what relative humidity at body temperature?
a. Approximately 100%
b. Approximately 60%
c. Approximately 40%
d. Approximately 20%
ANS: D
Although the humidifier fully saturates the gas, the low operating temperature limits total water vapor capacity to approximately 9.4 mg/L water vapor, equivalent to approximately 21% of body humidity.
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