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# Weather Notes: Air Pressure (1.2)

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Notes on
air pressure
density
altitude

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• ### Weather Notes: Air Pressure (1.2)

1. 1. RECAP WHAT WE KNOW Quickwrite: What is air? How does air affect us? Tuesday, February 10, 2009
2. 2. OBJECTIVES What is air? What are the properties of air? Tuesday, February 10, 2009
3. 3. DOES AIR HAVE MASS? Mr. Fox has no idea if air has mass? He is very embarrassed. Please help him by designing a quick experiment to test if air has mass. Brainstorm a couple of ideas and then try one out. Tuesday, February 10, 2009
4. 4. PROPERTIES OF AIR Density = Mass divided by Volume If a you 16 ml of a gas and it’s mas is 4g. What is it’s density? If you have 10ml of a gas with a density of 0.04 g/ml. How many grams of gas do you have? Tuesday, February 10, 2009
5. 5. UNDER PRESSURE Pressure: The force pushing on an area or surface Air pressure: comes from the heavy column of air pushing down The weight of the column of air above you is as heavy as a school bus!!! Why doesn’t it squash you? Tuesday, February 10, 2009
6. 6. DENSITY AND PRESSURE How do you think density and pressure are related? Tuesday, February 10, 2009
7. 7. MEASURING AIR PRESSURE Measured by a Barometer in millibars or inches of mercury. Sketch of barometer. Tuesday, February 10, 2009
8. 8. ALTITUDE Motivational Quote: Your attitude determines your altitude! Air pressure decreases as altitude increases. As air pressure decreases, so does density. Give an example of this phenomenon. Tuesday, February 10, 2009
9. 9. SKETCH Sketch Mount Everest showing a microscopic view of the air molecules at the base and a view at the top. Tuesday, February 10, 2009
10. 10. COOL AT HOME DEMO Magic Glass Tuesday, February 10, 2009
11. 11. HOMEWORK Questions: Page 14 #’s 1-3 Tuesday, February 10, 2009