CONDENSATION EVENTS Lecture 12

CONDENSATION EVENTS Lecture 12 - CONDENSATION EVENTS...

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** 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 * clouds & fog: need cloud-condensation nuclei on which to form * 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 *** CLOUDS ** cloud: a form of condensation best described as a dense visible aggregation of minute moisture droplets and/or tiny crystals of ice. * How do they form? A parcel of moist air reaches the point of saturation where the water vapor is changed to liquid water droplets. Either by cooling the air T° to the d.p. T° OR by adding more water vapor. Cooling the air T° is the most common method.
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This note was uploaded on 10/07/2011 for the course GEOG 1111 taught by Professor Hopkins during the Fall '08 term at UGA.

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CONDENSATION EVENTS Lecture 12 - CONDENSATION EVENTS...

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