CK-12 Physical Science Concepts - For Middle School

http://www.ck12.org Chapter 4. Motion and Forces

those elevations (altitudes). Then make a graph of the atmospheric pressures of the five cities. Use the type of graph
that best shows how the cities differ in atmospheric pressure. Be sure to label both axes of your graph.

http://www.worldatlas.com/aatlas/infopage/elvation.htm

http://www.engineeringtoolbox.com/air-altitude-pressure-d_462.html

Review

1. Describe how air pressure in the atmosphere changes from sea level to the top of the atmosphere.


2. What factors explain why atmospheric pressure changes as altitude increases?


3. Explain how differences in air pressure allow us to breathe.