Explain the processes involved when water changes state. Use a psychrometer or hygrometer and appropriate tables to determine the relative humidity and dew-point temperature of the air. Explain the adiabatic process and its effect on cooling and warming the air.

Natural environments the atmosphere

(From Applications and Investigations in Earth Science, Fifth Edition, Edward J. Tarbuck, Frederick K. Lutgens, Dennis Tasa and Kenneth G. Pinzke. Copyright © by
Pearson Education Inc. Published by Prentice-Hall, Inc. All rights reserved.)

Lecture Reference Material:
• Chapter 5 (Atmospheric Moisture)

Lab Objectives:
• Explain the processes involved when water changes state.
• Use a psychrometer or hygrometer and appropriate tables to determine the relative humidity and dew-point temperature of the air.
• Explain the adiabatic process and its effect on cooling and warming the air.
• Calculate the temperature and relative humidity changes that take place in air as the result of adiabatic cooling.
• Describe the global patterns of precipitation and its variability.

Materials Needed:
• Lab Manual
• Textbook
• Pencil
• Colored pencils
• Calculator
• Laptop
• Ruler
• Digital Psychrometer
• Hot plate
• Beaker
• Thermometers
• Water and ice