1. Unit: Water and the Atmosphere Lesson 2: Air Pressure
Essential Questions:
1.) What are some properties of air?
2.) What instruments measure air pressure?
3.) How does altitude affect air pressure and density?

2. What are some properties of air?
Mass
Density
Pressure

3. Air pressure is the result of the weight of the air column pushing on you.

4. What instruments measure air pressure?
A barometer is an instrument that measures air pressure.
The two types are:
1.) Mercury barometer
2.) Aneroid barometer

5. How does altitude effect air pressure and density?
As altitude (the distance above sea level) increases:
Pressure decreases
Density decreases