What is the simplest way to increase the humidity output of a ...

[student77]

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.

Question 2

Gas leaving an unheated humidifier at 10 C and 100 relative humidity (absolute humidity = 9.4 mg/L) would provide what relative humidity at body temperature?
 
  a. Approximately 100
  b. Approximately 60
  c. Approximately 40
  d. Approximately 20

[xthemafja]

Answer to Question 1

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.

Answer to Question 2

ANS: D
Although the humidifier fully saturates the gas, the low operating temperature limits total water vapor capacity to approximately 9.4 mg/L water vapor, equivalent to approximately 21 of body humidity.