The efficiency of a bubble humidifier is affected by which of the following?
a. Gas flow rate c. Aerosol production
b. Operating pressure d. Oxygen concentra-tion
ANS: A
As gas flow increases, the reservoir cools by as much as 10° C, thus limiting its effectiveness to provide humidity at flow rates higher than 10 L/min. An increased gas flow rate decreases the amount of contact time between the gas and the water. Increasing the height of the water column above the gas outlet increases the humidity content of the bubbles by allowing for the longer contact time.
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