1. AIR PRESSURE Does air have mass?
Mass- a body of matter with no specific shape
Read/complete “Does Air Have Mass?, p. 6

2. Air pressure- the weight of the air being
pulled down on an area of the
Earth’s surface

3. High Pressure- Regions of sinking air are called highs, high pressure regions or anticyclones. Clear skies and fair weather usually occur in these regions
Low Pressure- Regions of rising air are called lows, low pressure regions, depressions or cyclones. Clouds rain and strong winds often occur in these regions.

4. Read/Complete Factors of Weather: Air Pressure, pp. 7-8

5. AIR PRESSURE

6. AIR PRESSURE

7. BAROMETER- instrument that measures air pressure- two types---mercury barometer & aneroid barometer
Read/Complete “Measuring Air Pressure: A Barometer”, pp. 9-10