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Ch07_Precip_107 - Ch 7 Precipitation 7.1 Precipitation...

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Ch. 7 Precipitation 7.1 Precipitation Processes 7.2 Precipitation Types
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What’s Inside a Cloud?
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Precipitation Precipitation any form of water that falls from a cloud and reaches the ground
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Formation of Droplets - Condensation As air parcel rises and cools, it becomes saturated; further rising condensation occurs. Excess water vapor condenses on nuclei or aerosols to form tiny cloud droplets that grow Growth rate is inversely proportional to droplet size, meaning that as droplets grows bigger, its growth slows down. Surface to volume ratio decreases while growing Eventually the growth effectively stops before reaching raindrop size.
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Formation of Raindrop - Collision Process Larger drops fall faster than small droplets Rain drops are formed by collection small cloud droplets One rain drop captures millions of cloud droplets
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Trajectory of Rain Drops A rain drop needs to capture millions of droplets Thicker, juicy clouds produce larger drops
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Tiny SVP Difference between Water & Ice Solid ice holds molecules better than liquid water Water molecules escape or evaporate easier from droplets than ice crystals
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