Download Lesson 2 Air Pressure

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?

Mass

Density

Air pressure- the result of the
weight of the air column
pushing on you
A barometer is an instrument that
measures air pressure
The two types are:
1.) Mercury barometer
2.) Aneroid barometer
Altitude is the distance above sea level
As altitude increases:
 Pressure decreases
 Density decreases