chapter 3 ppt - Chapter 3 Earth’s Modern Atmosphere...

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Unformatted text preview: Chapter 3 Earth’s Modern Atmosphere Earth’s Modern Atmosphere: Topics Pressure Composition Temperature Function The principal substance of the atmosphere is air; a simple mixture of gases that is naturally odorless, colorless, tasteless, and formless, blended so thoroughly that it behaves as if it were a single gas. Cumulonimbus storm cloud system over Utah. Profile of Atmosphere Figure 3.2 Extends to 32,000 km >480 km – vacuum Subdivided into concentric “shells” or spheres,” all bound by gravity Three criteria Composition Temperature Function Atmospheric Pressure (1) Earth’s atmosphere exerts its weight, due to gravity Air is compressible Increased pressure Increased density Pressure due to Motion Size Number Figure 3.3 Atmospheric Pressure (2) Air is denser near surface, thins with altitude >50% of the total mass is compressed below 5.5 km, 99.9% is below 50 km At sea level, pressure: 1013.2 mb (millibars) 29.92 inches of Hg 14.7 lb/in 2 10 50 80 480 500 1013.2 Change in air pressure with altitude Figure 3.3 Figure...
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This note was uploaded on 10/16/2008 for the course PHYSICAL G 101 taught by Professor F during the Spring '08 term at E. Stroudsburg.

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chapter 3 ppt - Chapter 3 Earth’s Modern Atmosphere...

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