I. Humidity is a measure of : ________________________________________________________________.
How is water added to the air? ___________________________
II. Relative Humidity is: ____________________________________________ compared to
_________________________________________________________________________________________.
Questions:
1.
If air is holding HALF the water that it can hold, what is its relative humidity? ________%
2.
If air is holding ALL the water it can hold, the air is saturated, what’s the relative humidity? _____%
3.
If air is holding no water at all , what is its relative humidity? ________%
4.
If air is holding a quarter of the water that it can hold, what is its relative humidity ? _________%
III. If air is saturated , it is: _________________________________________________________________.
Warm air EXPANDS and can hold more water vapor than __________ air, so it takes more water to saturate warm air . If air is saturated , what is the relative humidity? ______________%
What will most likely occur when air is saturated and the temperature drops ? _________________
IV. Factors that Affect Relative Humidity
1.
______________________: If you increase the amount of water in the air,
Relative humidity will ________________________
2.
______________________: If you lower the temperature , relative humidity will ____________.
Which can hold more moisture?
Warm or cool air?
______________
V. Measuring Humidity
1. Relative humidity is measured using a ___________________________. It is made of two thermometers .
One thermometer is dry the other one is covered with a wet cloth . When air moves over the wet cloth, evaporation occurs and lowers the temperature on the wet thermometer . If you compare the temperature on the two thermometers you can get the relative humidity .
Psychrometer

VI. Condensation is:
A process by which __________________________________________________________________________
Condensation will occur when the air is ___________________, or has a relative humidity of ______%.
The air can’t hold any more water vapor, so the water condensed out of the air. This commonly happens when moist air is cooled , or comes in contact with a cool surface .
VII. Dew Point is the ___________________ at which____________________ will occur.
It is the temperature the air must be in order to be ______________________.
Which can hold more moisture? (warm or cool air) ___________
VIII. Cloud Formation: Clouds form when water vapor condenses on ________________________________.
Condensation nuclei are ___________________________________________________________________
Examples: Dust, ash, pollutants, pollen, and soot
A.
Cirrus Clouds-
B.
Cumulus Clouds-
C.
Stratus Clouds-
D. Cumulonimbus Clouds-
**Remember as altitude increases in the troposphere , temperature ______________ & condensation occurs.
*** All weather occurs in the ________________________ layer.