Which of the following are true about humidification and contact time?
1. The longer a gas is exposed to water, the greater is the amount of evaporation.
2. The rate of gas flow through a humidifier determines contact time.
3. Low flows decrease and high flows increase relative humidity output.
4. Bubble humidifier contact time depends on the water column depth.
a. 1 and 3 only
b. 1, 2, and 4 only
c. 3 and 4 only
d. 1, 2, 3, and 4
ANS: B
In passover and wick-type humidifiers, the flow rate of gas through the humidifier is inversely related to contact time, with high flow rates reducing the time available for evaporation to occur.
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