Physical Geography 101
Humidity, Clouds and Fog Study Guide


After the "Humidity, Clouds and Fog" lecture and readings you should be able to answer and discuss the following questions.

What is humidity?

By percent, how much water is there in the atmosphere?

Define absolute humidity and write this definition in an equation form.

Define specific humidity and write this definition in an equation form.

Define relative humidity and write this definition in an equation form.

Which measure of humidity is reported on the weather reports on radio and television?

What are the two means by which relative humidity can be changed?

A low air temperature means that the air has a ________ water holding capacity.

A high air temperature means that the air has a ________ water holding capacity.

If temperature changes will the amount of water in the air necessarily change?

If the amount of water in the air increase or decreases is there a change in temperature?

Define dew point temperature.

Can the air temperature ever be lower than the dew point temperature?

What is the adiabatic process?

What is the numeric value of the Dry Adiabatic Lapse Rate (in Metric units)?

What does this value mean?

What is the Wet Adiabatic Lapse Rate?

Describe the steps that lead to the formation of a cloud?

Why is the Wet Adiabatic Lapse Rate a slower rate than the Dry Adiabatic Lapse Rate?

What are clouds?

What are the four families of clouds?

What are the two classes of clouds?

What is fog?

What is the significance of fog forming at ground level?