Ch04_Moisture_107 - Ch. 4 Atmospheric Moisture 4.1 Water in...

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Ch. 4 Atmospheric Moisture 4.1 Water in the Atmosphere 4.2. Measure of Humidity Atmospheric vapor (or moisture) varies 0-4%; humidity measures how much vapor is present in atmosphere. Vapor condenses to forms clouds and precipitation. http://www.classzone.com/books/earth_science/terc/content/visualizations/es1801/es1801page01.cfm?chapter_no=visualization
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Formation of Liquid Drops In warmer air, fast- moving molecules tend to bounce off. In colder air, slow- moving molecules likely cluster together. Condensation occurs on condensation nuclei , small suspending particles, if cold enough
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Condensation and Clouds Clouds consist of billions of droplets and ice crystals
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4.2 Measure of Atmospheric Moisture How much moisture in the air is crucial to weather. The moisture content is measured in several ways: Humidity (absolute, relative) Vapor pressure Dewpoint temperature
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Absolute Humidity Absolute humidity is also called density in unit of gram per cubic meter.
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Actual Vapor Pressure Recall atmosphere pressure is the forces exerted by weight of entire column; Air is made up of 78% nitrogen, 21% oxygen, and 0-4% water vapor. Total pressure is proportionally contributed by
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This note was uploaded on 03/17/2012 for the course UNDERSTAND 212 taught by Professor Qi during the Spring '12 term at Saint Louis.

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Ch04_Moisture_107 - Ch. 4 Atmospheric Moisture 4.1 Water in...

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