When checking a patient attached to a servo-controlled heated-wire humidifier breathing circuit, you notice no visible condensate anywhere in the tubing
Based on this observation, you can conclude that the relative humidity of the delivered gas is which of the following?
a. Less than 25%
b. 25% to 90%
c. 90% to 100%
d. Less than 100%
ANS: D
If condensate cannot be seen, there is no way of knowing the level of relative humidity without direct measurement—it could be anywhere between 99% and 0%.
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