Which of the following statements about humidifiers is appropriate?
a. The warmer the gas, the less water vapor it can hold.
b. Evaporation occurs more rapidly with a large water-to-gas surface area.
c. High peak flows improve the efficacy of a humidifier.
d. The mass of the water is inversely propor-tional to its capacity to transfer heat.
ANS: B
Larger surface areas will increase the amount of evaporation that will occur. The warmer the gas, the more water it can hold. High flows through a humidifier decrease its efficiency, because there is less time for contact between the gas and water. According to the principles of thermodynam-ics, the mass of the water is directly proportional to its capacity to transfer heat. See also Box 6-4.
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