A patient receiving oxygen at 2 L/min via nasal cannula complains of nasal dryness but has no retained secretions. Which device is most appropriate?  

A gas at 20°C contains 12 mg/L of water vapor. The maximum water capacity at 20°C is 17 mg/L. Calculate the relative humidity.

Which passover humidifier provides the greatest surface area for evaporation?  

A patient with a tracheostomy is receiving a heated humidifier. During rounds, the therapist notices copious condensation in the inspiratory tubing. What is the best action?  

A patient is receiving gas containing 14 mg/L of water vapor at 20°C. The maximum capacity at 20°C is 17 mg/L.    

Which factor has the greatest effect on the amount of water vapor a gas can hold?  

A humidifier with a larger thermal mass is expected to:  

Which passover humidifier uses a hydrophobic membrane?

Which of the following factors increase evaporation in a humidifier? Higher gas temperature Greater surface area Longer contact time Greater thermal mass  

Which statements regarding thermal mass are true? A greater volume of water increases thermal mass. Larger thermal mass improves heat transfer. Greater thermal mass helps maintain a stable gas temperature. Smaller thermal mass stores more heat.