1. AIR PRESSURE
What caused
this tank car
to crush? 1

2. AIR PRESSURE
AIR PRESSURE
AIR PRESSURE
AIR PRESSURE 2

3. Air pressure pushes mercury up!
MEASURING PRESSURE
Air pressure is measured by a barometer
AIR PRESSURE
AIR PRESSURE
Air pressure pushes mercury up! 3

4. Measuring Pressure
Air pressure is measured in three different scales…
Atmosphere (atm)
Millibars (mb)
Inches mercury
(in hg)
1 atm= _____mb
1 atm= _____in Hg 4

5. Weather Map…Without Data!
Weather Map…With Pressure Data! 5

6. 6 ISOBARS- lines connecting equal pressure Find the LOWEST pressures…
Draw an isobar

7. 7 H L Label the high pressure area with H
Label the low pressure area with L H L

8. Where in the US is the air pressure high?
Where is the air pressure low?

9. Drawing ISOBARS
Find the Highest pressures…
Draw an isobar