Chapter 06: Humidity and Aerosol Therapy

Chapter 06: Humidity and Aerosol Therapy

 

Complete Chapter Questions With Answers

 

Sample Questions Are Posted Below

 

MULTIPLE CHOICE

 

1. Which of the following statements is true?

a.	Water that exists in the form of individual molecules in a gaseous state is humidity.
b.	Water that exists in the form of individual molecules is an aerosol.
c.	Water that exists in the form of particulate matter is relative humidity (RH).
d.	Water that exerts no pressure is a vapor.

 

 

ANS:  A

Humidity is water that exists in the form of individual molecules in the vaporous or gaseous state. An aerosol is a suspension of solid or liquid particles in a gas. Water vapor does exert pressure, although the pressure may vary.

 

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2. Which of the following statements is true?

a.	Fog and mist are considered water vapor.
b.	Medical aerosols are much smaller than molecules of water.
c.	Medical aerosols range from 0.2 mm to 50 mm.
d.	All of the above are true.

 

 

ANS:  C

Medical aerosol must deposit anywhere from the upper airways to the lower airways; therefore, it must be the appropriate size for the target site, with a range of 0.2 mm to 50 mm. Fog and mist are considered aerosols, not water vapor. Medical aerosols need to be larger than water vapor molecules—otherwise they would be too stable to deposit at their target site.

 

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3. A patient is receiving albuterol through a small-volume nebulizer. Where in the body will the greatest effect take place?

a.	Localized effect in the lungs
b.	Systemic effect
c.	Local and systemic effect
d.	Depends on the size, temperature, and volume of the aerosol

 

 

ANS:  D

Aerosols have the potential to cause both local and systemic effects. However, these effects largely depend on the drug concentration delivered, particle size, temperature, and volume of the aerosol.

 

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4. Which of the following is true concerning water vapor?

a.	It is a true gas.
b.	It has a constant pressure.
c.	It exerts a partial pressure.
d.	It exists above its critical temperature.

 

 

ANS:  C

Water vapor exerts a pressure (PH₂O) that results from the continuous, random movement of water molecules. It is not a true gas and does not have a constant pressure. As the temperature of a gas increases, water vapor pressure increases and water molecules leave the liquid state through evaporation.

 

PTS:   1                    REF:   Page 159

 

5. A water molecule at the surface contains enough kinetic activity to enter the vapor state. This is the definition of which of the following?

a.	Evaporation	c.	The boiling point
b.	Vaporization	d.	The critical point

 

 

ANS:  A

Evaporation occurs when liquid molecules near the surface contain enough kinetic energy to break free and enter a vapor state without the addition of heat. Vaporization is the energy required to vaporize a liquid. The boiling point is when the water is heated to a point at which molecules leave the liquid state and produce water vapor.

 

PTS:   1                    REF:   Page 159