The subject is natural environments the atmosphere
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