GEOG 2110L Lecture Notes - Cloud Condensation Nuclei, Nimbostratus Cloud, Dew Point
17 Mar 2014
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Document Summary
** clouds, fog, and dew all have 2 properties in common: 1) they must form from saturated or nearly saturated air. Rh = 100%, dew point t = air t . 2) they must have a surface upon which the water vapor can condense. * dew: the ground, vegetation, a car, or similar surface. * microscopic particles necessary as matter (a surface) on which water vapor condenses to form moisture droplets. * can be particles of dust, sea salts, soot, ash, etc. * hygroscopic nuclei: are very water absorbent condensation nuclei usually of sulfate & nitrate crystals. ** cloud: a form of condensation best described as a dense, visible aggregation of minute moisture droplets and/or tiny crystals of ice. * classified by altitude of occurrence & by shape. A parcel of moist air reaches the point of saturation where the water vapor is changed to liquid water droplets. Cooling the air t is the most common method.
