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    Wednesday, November 26, 2008




    Atmospheric Decoration

    Clouds form when humid air cools enough for water vapor to condense into droplets or ice crystals. The altitude at which this happens depends on the humidity and the rate at which temperature drops with elevation

    Normally, water vapor can only condense onto condensation nuclei—tiny particles that serve as kernels around which drops can form.

    Condensation nuclei are often nothing but natural dust. But soot particles from automobile exhaust or other types of pollution can also serve the purpose. One study has found that changing levels of air pollution cause different rates of cloud formation (and rain) on weekends and weekdays, at least in humid climates with lots of cities.

    Cloud Types

    Photo Gallery: Clouds

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