GIANNETTA WEATHER |
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"N O T E"
All weather articles written by the author,
weather records for Bath, Pa. USA, graphs,
graphics, pictures, are copyrighted and are owned by the author.
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**Clouds & Weather Part II of II** |
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Our atmosphere contains substances which attract water vapor by a chemical
magnetism. Sea salt, spuming into the air from oceans, is one example.
Chemial wastes from industrial processes have an affinity for water.
These different microscopic bits lure for water vapor are called:
**Hygroscopic or Condensation Nuclei** |
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They play a most important behind the scenes role in the process of most
forms of condensation.
When watervapor condenses into visible moisture, the droplets are much too
small to be seen with the naked eye. They gather around the myriads of tiny
condensation nuclei in the air - the salt spray, dust, pollen, and join
up in incredible numbers as a group to form a cloud.
**Water droplets are so small, you could put more than 100 million in a teaspoon** |
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At the center of each droplet of water or ice is even a tiner speck of dust,
salt, smoke.
All clouds consist of an assemblage of minute water droplets, ice crystals,
or a combination of both. The free floating clouds at very high altitudes
(where below freezing temperatures exist) consist of tiny prisms of ice
formed by the process of:
Sublimation |
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In this process water vapor turns directly into ice without going through
the liquid stage. Clouds frequently contain water droplets which may exist
as water even at levels where temperatures are below freezing. These water
droplets are said to be:
Supercooled |
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Surface tension on the minute droplets keep them in water form. They are
unstable and rupture into ice.
© 1998 Charles A. Giannetta