An individual's humidity deficit will be the smallest when breathing:
a. oxygen through a heated-wick humidifier.
b. room air through a heat and moisture ex-changer.
c. room air at 30? C and 50% relative humid-ity.
d. by nasal cannula (6 L/min) with a bubble humidifier.
ANS: A
A wick humidifier can deliver 44 mg/L of water vapor as compared with 10 to 31 mg/L from a heat and moisture exchanger, 15 mg/L from room air at 30? C and 50% relative humidity, and 10 to 20 mg/L from a bubble humidifier.
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