What is the simplest way to increase the humidity output of a humidifier?
a. Increase the time that the gas and the wa-ter are in contact.
b. Increase the surface area between the wa-ter and the gas.
c. Decrease the water vapor pressure of the gas.
d. Increase the temperature of either the wa-ter or the gas.
ANS: D
Simply heating the humidifier to 40° C (Figure 38-3, right) increases its output to 51 mg/L, which is more than adequate to meet BTPS conditions.
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