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Moisture and Atmospheric Stability
Objectives
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 After reading, studying, and discussing Chapter 4, you should be able to:
- Describe the movement of water through the hydrologic cycle.
- Discuss the processes and energy requirements by which water changes from one state of matter to another.
- Distinguish among absolute humidity, mixing ratio, vapor pressure, relative humidity, and dew point as methods to express the water vapor content of the air.
- Explain the two ways that relative humidity can be changed.
- Describe the principle that governs the use of a psychrometer in determining relative humidity and dew point.
- Discuss the adiabatic process and its role in cloud formation.
- State the four mechanisms that cause air to rise.
- List and describe the atmospheric conditions which determine the stability of air and the various types of stability.
- List and discuss the factors that modify the stability of air.
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